NEET Biology Cell Multiple Choice Questions – The Unit Of Life

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Cell The Unit Of Life Multiple Choice Questions And Answers

Question 1. Which of the following cytoskeletal elements plays an important role in the movement of chromosomes?

  1. Microfilamenls
  2. Microtubules
  3. Intermediate filaments
  4. All of these

Answer: 2. Microtubules

Question 2. The bacterial genome or nucleoid is made up of

  1. A single double-stranded chromosome with histone
  2. UNA and histories
  3. single double-stranded DNA, not complexed with histone proteins, nor packed in the chromosome
  4. A single-stranded circular DNA

Answer: 3. single double-stranded DNA, not complexed with histone proteins, nor packed in the chromosome

Question 3. In bacterial cells. DNA is extensively looped and coiled with the help of

  1. Acid proteins
  2. Ilistories
  3. Basic nucleoid proteins called as polyamines
  4. Actin

Answer: 3. Basic nucleoid protein called as polyamines

Question 4. Two animal cells are interconnected by

  1. Plasmodesmata
  2. Cell wall
  3. Desmosomc
  4. Plasma membrane

Answer: 3. Desmosomc

Question 5. The type of growth shown by the primary cell wall is

  1. Accretionary
  2. Instussuceptionary
  3. Protoplasmic
  4. None, as it cannot expand or grow

Answer: 2. Instussuceptionary

Question 6. Plasmodesmata often has ER (endoplasmic reticulum) tubule called as

  1. Symplasm
  2. Desmotubulc
  3. Apoplasm
  4. Intermediate filaments

Answer: 2. Desmotubulc

Question 7. Which of the following is associated with the detoxification of drugs and muscle contraction by the release and uptake of Ca+2 ions?

  1. Golgi complex
  2. RER
  3. SER
  4. Free ribosomes

Answer: 3. SER

Question 8. The main organelle involved in the modification and routing of newly synthesized proteins to their destination is

  1. Chloroplast
  2. Mitochondria
  3. Lysosome
  4. Endoplasmic reticulum

Answer: 4. Endoplasmic reticulum

Question 9. The term endoplasmic reticulum was used by

  1. Keith Poter
  2. Thompson
  3. Robertson
  4. Keith Peter and Thompson

Answer: 1. Keith Potcr

Question 10. Ribosomes, when associated with ER, attach with their

  1. Smaller subunit
  2. Larger subunit (60S)
  3. BOS subunit
  4. Either by smaller or by larger subunits

Answer: 1. Smaller subunit

Question 11. Ribosomes are attached to the endoplasmic reticulum through

  1. Ribophorins
  2. r-RNA
  3. t-RNA
  4. Hydrophobic interaction

Answer: 1. Ribophorins

Question 12. RER is well developed in cells engaged in the synthesis of

  1. Nucleotides
  2. Proteins
  3. Lipids
  4. Secretory products

Answer: 2. Proteins

Question 13. SER is mainly found in cells actively engaged in

  1. Secretion activity
  2. Protein metabolism
  3. Lipid metabolism
  4. Catabolic activity

Answer: 3. Lipid metabolism

Question 14. Golgi apparatus/apparato reticular is specialized for all except

  1. Glycosidation and glycosylation of lipids and proteins
  2. Recycling of the plasma membrane pinched off by pinocytosis and phagocytosis
  3. Secretion
  4. Intracellular digestion

Answer: 4. Intracellular digestion

Question 15. Which of the following statements is incorrect about the Golgi apparatus?

  1. The sacs on the forming face (cis-face) are associated with ER.
  2. Golgi apparatus was studied by Camillo Golgi in the nerve cells of owls by metallic impregnation technique.
  3. Golgi apparatus in plants is called as dictyosome and secretes mucilage in the root cap cells.
  4. Golgi apparatus has no role in the modification of proinsulin.

Answer: 4. Golgi apparatus has no role in the modification of proinsulin.

Question 16. Lysosomes are formed by budding off vesicles from Golgi apparatus and contain

  1. Oxidizing enzymes
  2. 40 different acid hydrolases
  3. Respiratory enzymes
  4. Basic hydrolases

Answer: 2. 40 different acid hydrolases

Question 17. Which of the following is likely to show the absence of lysosomes?

  1. Cyanophyceae
  2. Protozoa
  3. Anther tapetum
  4. Mammalian leucocytes

Answer: 2. Protozoa

Question 18. Lysosomes were first discovered by

  1. Rohdin
  2. Pemer
  3. Christian de Duve
  4. None of these

Answer: 3. Christian de Duve

Question 19. Which of the following organelles show polymorphism?

  1. Golgi apparatus
  2. Lysosome
  3. Mitochondria
  4. Chloroplast

Answer: 2. Lysosome

Question 20. Autolysis is associated with

  1. Ribosome
  2. Kinetosome
  3. Lysosome
  4. Golgi apparatus

Answer: 3. Lysosome

Question 21. Which of the following organelles possess oxidases and are associated with oxidation reactions other than those of respiration?

  1. Spherosomcs
  2. Peroxisomes
  3. Lysosomes
  4. Golgi

Answer: 2. Peroxisomes

Question 22. Which of the following organelles takes part in photorespiration?

  1. Glyoxysome
  2. Peroxisome
  3. Dictyosome
  4. ER

Answer: 2. Peroxisome

Question 23. Peroxisomes contain peroxide-producing enzymes. These are found in

  1. Plant cells
  2. Animal cells
  3. Both (1) and (2)
  4. Bacteria and blue-green algae

Answer: 3. Both (1) and (2)

Question 24. Which of the following is a peroxide-destroying enzyme present in peroxisome?

  1. Urate oxidase
  2. Catalase
  3. Amino acid oxidase
  4. Peroxidase

Answer: 2. Catalase

Question 25. Non-secretory proteins are synthesized by

  1. ER-bound ribosomes
  2. Free ribosomes
  3. Polysomes
  4. Endosomes

Answer: 2. Free ribosomes

Question 26. Find out the incorrect statement with respect to glyoxysomes.

  1. It is reported from the endosperm of germinating seeds.
  2. They usually occur in fat-rich plant cells.
  3. They are associated with the glyoxylate cycle.
  4. They develop from mitochondria.

Answer: 4. They develop from mitochondria.

Question 27. The proper folding of proteins following synthesis is assisted by

  1. Polyribosomes
  2. Specific proteins called chaperons
  3. Polysomes
  4. Free ribosomes

Answer: 2. Specific proteins called chaperons

Question 28. Protein synthesis in an animal cell occurs

  1. Only on the ribosomes present in the cytosol
  2. Only on ribosomes attached to the nuclear envelope and ER
  3. On ribosomes present in the cytoplasm as well as in mitochondria
  4. On ribosomes present in the nucleolus as well as in the cytoplasm

Answer: 3. On ribosomes present in the cytoplasm as well as in mitochondria

Question 29. When ATP concentration is low or the respiratory chain is inhibited, the mitochondria are seen in

  1. Active state
  2. Condensed state
  3. Orthodox state
  4. Both (1) and (2)

Answer: 3. Orthodox state

Question 30. Mitochondria and chloroplasts are semi-autonomous as they possess

  1. DNA
  2. DNA + RNA
  3. DNA + RNA ribosomes
  4. Proteins

Answer: 3. DNA + RNA ribosomes

Question 31. Which of the following organelles is concerned with the generation of ATP through electron transport and oxidative phosphorylation?

  1. Chloroplast
  2. Mitochondria
  3. Glyoxysome
  4. Both (1) and (2)

Answer: 2. Mitochondria

Question 32. F0-F1 particles are also called as

  1. Quantasomes
  2. Glyoxysome
  3. Parade particles
  4. Oxisomes

Answer: 4. Oxisomes

Question 33. Organelle rich in Manganese is

  1. Ribosome
  2. Mitochondria
  3. Chloroplast
  4. Nucleus

Answer: 2. Mitochondria

Question 34. The presence of DNA in mitochondria and chloroplast supports the hypothesis that

  1. Glycolysis occurs in both mitochondria and chloroplast
  2. Mitochondria and chloroplast both originated as independent free-living organisms
  3. ATP is produced in mitochondria as well as in chloroplast
  4. Mitochondria and chloroplast undergo meiosis and mitosis independent of the nucleus

Answer: 2. Mitochondria and chloroplast both originated as independent free-living organisms

Question 35. Synthesis of ATP in mitochondria takes place

  1. In the matrix
  2. In the Intracoastal space
  3. At the cristae
  4. At the outer membrane

Answer: 3. At the cristae

Question 36. Oxysomes are submicroscopic particles present on the

  1. Surface of the inner membrane of the mitochondrion
  2. Thylakoid membrane of chloroplasts
  3. The outer membrane of the mitochondrion
  4. Rough endoplasmic reticulum

Answer: 1. Surface of the inner membrane of the mitochondrion

Question 37. Mitochondria are not found in

  1. Mature WBC
  2. Mature RBC
  3. Nerve cell
  4. Sperm

Answer: 2. Mature RBC

Question 38. The mitochondrial DNA differs from the nuclear DNA in

  1. Lacking association with histones
  2. Being circular in nature
  3. Having a higher C-G ratio
  4. All of these

Answer: 4. All of these

Question 39. Genes for cytoplasmic male sterility in plants are generally located in

  1. Mitochondrial genome
  2. Chloroplast genome
  3. Nuclear genome
  4. Cytosol

Answer: 1. Mitochondrial genome

Question 40. Chlorophyll in chloroplasts is located in

  1. Grana
  2. Pyrenoid
  3. Stroma
  4. Both grana and stroma

Answer: 1. Grana

Question 41. Which of the following organelles stores proteins?’

  1. Amyloplasts
  2. Aleuroplasts
  3. Plastids
  4. Elaioplasts (oleosomes)

Answer: 2. Aleuroplasts

Question 42. Grana in chloroplast is formed by the piling of

  1. Cristae
  2. Thylakoids
  3. Oxisomes
  4. Dictyosomes

Answer: 2. Thylakoids

Question 43. The symbiont hypothesis suggests that there are similarities between prokaryotes, mitochondria, and chloroplasts like

  1. Presence of circular DNA associated with histones and 70S ribosomes
  2. The presence of circular DNA net associated with histones and 70S ribosomes present
  3. 50S ribosomes and DNA
  4. 30S ribosomes and DNA

Answer: 2. Presence of circular DNA net associated with histones and 70S ribosomes present

Question 44. Quantasomes are found in

  1. Mitochondria
  2. Chloroplast
  3. Nucleus
  4. Lysosome

Answer: 2. Chloroplast

Question 45. Each quantasome contains

  1. 100 chlorophyll molecules
  2. 200 chlorophyll molecules
  3. 300 chlorophyll molecules
  4. 230 chlorophyll molecules

Answer: 4. 230 chlorophyll molecules

Question 46. Hammerling’s experiment on Acetabularia proved the role of

  1. Chromosomes in heredity
  2. Nucleus in heredity
  3. Nucleo-cytoplasmic ratio
  4. Cytoplasm in controlling differentiation

Answer: 2. Nucleus in heredity

Question 47. At certain places, the nuclear envelope is interrupted by the presence of nuclear pores which are enclosed by circular structures called as

  1. Perinuclear space
  2. Annuli
  3. Pore complex
  4. Nucleolus

Answer: 2. Annuli

Question 48. The main site for ribosomal RNA synthesis is

  1. Nucleus
  2. Nucleolus
  3. Endoplasmic reticulum
  4. Nucleolus

Answer: 2. Nucleolus

Question 49. Telomeres

  1. Initiate RNA synthesis
  2. Seal ends of chromosomes
  3. Have guanine-rich repeats
  4. Both (2) and (3)

Answer: 4. Both (2) and (3)

Question 50. The term nucleolus was coined by

  1. Bowman
  2. Fontana
  3. Flemming
  4. Leeuwenhoek

Answer: 1. Bowman

Question 51. Telomerase is an enzyme that is a

  1. Simple protein
  2. RNA
  3. Fibonucleoprotein
  4. Repetitive DNA

Answer: 3. Fibonucleoprotein

Question 52. The nucleolus is produced from

  1. 1° constriction
  2. Nucleolus-organizing region of certain chromosomes
  3. Nuclear envelope
  4. ER

Answer: 2. Nucleolus-organizing region of certain chromosomes

Question 53. A cystolith is a deposit of

  1. Calcium citrate
  2. Calcium carbonate
  3. Silica
  4. Calcium oxalate

Answer: 2. Calcium carbonate

Question 54. Which of the following suggests advanced features of an organism?

  1. The karyotype shows a large size difference between the smallest and the largest chromosome.
  2. Karyotype has few metacentric chromosomes.
  3. Asymmetric karyotype
  4. All of these

Answer: 4. All of these

Question 55. Tolbert is associated with which one of the following cell structures?

  1. Peroxisomes
  2. Spherosomes
  3. Quantasomes
  4. Glyoxysomes

Answer: 1. Peroxisomes

Question 56. A single mitochondrion is found in

  1. Flight muscles of insects
  2. Human sperm
  3. Micrasterias
  4. Chaos chaos

Answer: 3. Micrasterias

Question 57. The smallest cell organelle is

  1. Peroxisome
  2. Spherosome
  3. Ribosome
  4. Lysosome

Answer: 3. Spherosome

Question 58. The complex formed of centriole and kinoplasm called as

  1. Diplosome
  2. Centrosphere
  3. Centrosome
  4. Kinetosome

Answer: 3. Centrosome

Question 59. Man and mouse cells are treated with red am green fluorescent dyes separately and are made to fuse. The resultant cells when kept at 37°C, the distribution of dye on the surface of cell will be

NEET Biology Cell The Unit Of Life Man And Mouse Cells Are Treated With Red Am Green Fluorescent Dyes

Answer: 4

Question 60. Adenosine triphosphate (ATP) powers the movement of cilia and flagella. Adenosine triphosphatase activity is present in

  1. Nexin protein
  2. Dynein protein
  3. Massule
  4. Both (1) and (2)

Answer: 2. Dynein protein

Question 61 The r-RNAs of BOS ribosomes of larger subunits are

  1. 18S
  2. 23S + 5S
  3. 28S + 5.8S + 5S
  4. 16S

Answer: 3. 28S + 5.8S + 5S

Question 62. A component of the cytoskeleton is

  1. Microtubule
  2. Bone
  3. Chitin
  4. Cartilage

Answer: 1. Microtubule

Question 63. Kinetochore is the

  1. Fibrous granular structure within the centromere
  2. Surface of centromere
  3. Constriction near chromosome end
  4. End of chromosome

Answer: 2. Surface of centromere

Question 64. Who amongst the following scientists is credited with the discovery of cell and published Micrographia?

  1. Robert Brown
  2. Robert Hooke
  3. Schleiden
  4. Schwann

Answer: 2. Robert Hooke

Question 65. Who was the first to observe living substances in the cells?

  1. Anton van Leeuwenhoek
  2. Alfonso Corti
  3. Robert Brown
  4. Johannes Purkinje

Answer: 1. Anton van Leeuwenhoek

Question 66. The nucleus was first observed in the cells of orchid roots in 1831 by

  1. Robert Brown
  2. Hugo von Mohl
  3. Schleiden
  4. Schwann

Answer: 2. Hugo von Mohl

Question 67. “Protoplasm is the physical basis of life” was stated by

  1. Purkinje
  2. Huxley
  3. Rudolf Virchow
  4. Schwann

Answer: 2. Huxley

Question 68. Which of the following does not show a circular DNA?

  1. Bacterial cell
  2. Nucleus
  3. Mitochondria
  4. Chloroplast

Answer: 2. Nucleus

Question 69. The saccules and utricles were names used for the cells by which of the following?

  1. Robert Brown
  2. Malpighii
  3. Purkinje
  4. Swanson

Answer: 4. Swanson

Question 70. The cells discovered in the thin section of cork by Robert Hooke were actually

  1. Cellulose
  2. Living cell
  3. Cell coat
  4. Cell wall

Answer: 3. Cell coat

Question 71. Most of the water found in the cell occurs in

  1. Cell wall
  2. Nucleus
  3. Cytoplasm
  4. Nucleolus

Answer: 3. Cytoplasm

Question 72. Which of the following is described as the “energy currency of the cell”?

  1. DNA
  2. RNA
  3. ATP
  4. Vitamins

Answer: 1. DNA

Question 73. Cell theory was put forward by

  1. Schleiden and Schwann in 1838-39
  2. Sutton and Boveri
  3. Watson and Crick
  4. Darwin and Wallace

Answer: 4. Darwin and Wallace

Question 74. Cell theory is applicable to all except

  1. Animals
  2. Plants
  3. Fungi
  4. Viruses

Answer: 2. Plants

Question 75. Who was the first to explain that the cells divide and new cells are formed from the pre-existing cells (Omnis cellu-la-e-celluld) in 1855?

  1. Louis Pasteur
  2. Rudolf Virchow
  3. Nagaii
  4. Robert Brown

Answer: 4. Robert Brown

Question 76. The longest cell in the human body is

  1. Liver cell
  2. Muscle cell
  3. Neuroglia cell
  4. Nerve cell

Answer: 4. Nerve cell

Question 77. What is absent in mammalian erythrocytes?

  1. Aerobic respiration
  2. Nucleus
  3. DNA
  4. All of these

Answer: 4. All of these

Question 78. One of the following is an exception to the cell theory.

  1. Bacteria
  2. Prokaryotes
  3. Blue-green algae
  4. Bacteriophage

Answer: 2. Prokaryotes

Question 79. The membrane covering the vacuole is known as

  1. Desmosomes
  2. Tonoplast
  3. Plasmodesmata
  4. Tyloses

Answer: 1. Desmosomes

Question 80. Which is a non-membranous (not covered by a membrane) organelle? 

  1. Ribosome
  2. Lysosome
  3. Mitochondria
  4. Chloroplast

Answer: 3. Mitochondria

Question 81. Which one of the following is absent in plant cell?

  1. Vacuole
  2. Cell wall
  3. Centrosome
  4. Plastids

Answer: 1. Vacuole

Question 82. Which one of the following does not have the ability to divide?

  1. Nerve cells
  2. Liver cells
  3. Muscle cells
  4. Bone marrow cells

Answer: 3. Muscle cells

Question 83. The prokaryotic cells are characterized by

  1. Distinct chromosome
  2. Absence of chromatin material
  3. Absence of nuclear membrane
  4. Distinct nuclear membrane

Answer: 1. Distinct chromosome

Question 84. Cells originate

  1. From pre-existing cells
  2. From abiotic materials
  3. By bacterial fermentation
  4. By regeneration of old cells

Answer: 1. From pre-existing cells

Question 85. Which of the following is present in both plant and animal cells?

  1. Primary wall
  2. Secondary wall
  3. Plasma membrane
  4. Plastids

Answer: 1. Primary wall

Question 86. Which of the following has a one-envelope system?

  1. Prokaryotic cell
  2. Eukaryotic cell
  3. Both (1) and (2)
  4. None of these

Answer: 4. None of these

Question 87. Small cells are metabolically active as they have

  1. Higher surface-area-to-volume ratio
  2. Higher nucleo-cytoplasmic ratio
  3. Glycoproteins and glycolipids
  4. Lower nucleo-cytoplasmic ratio
  5. Both (1) and (2)

Answer: 4. Both (1) and (2)

Question 88. Which of the following cells do not show DNA duplication or RNA synthesis?

  1. Liver cells
  2. Muscle cells
  3. Nerve cells
  4. Mature RBCs

Answer: 1. Liver cells

Question 89. Who proposed that the cells are totipotent?

  1. Haberlandt
  2. Maheshwari
  3. Steward
  4. White

Answer: 2. Maheshwari

Question 90. The surface-to-volume ratio of a cell

  1. Remains constant
  2. Decreases with increasing size
  3. Increases with increasing size
  4. Both (2) and (3)

Answer: 4. Both (2) and (3)

Question 91. The cells which are capable of undergoing division and development are

  1. Meristematic cells
  2. Stem cells
  3. Differentiated cells
  4. Both (1) and (2)

Answer: 2. Stem cells

Question 92. The tri-lamellar model was proposed by

  1. J.D. Robertson
  2. Danielli and Davson
  3. Goiter and Grindell
  4. Singer and Nicolson

Answer: 4. Singer and Nicolson

Question 93. An animal cell differs from plant cells in not having

  1. Plastids
  2. Cell wall
  3. Glyoxysome
  4. All of these

Answer: 4. All of these

Question 94. The genetic material of a bacterial cell is localized within a discrete region called as

  1. Nucleus
  2. Nucleolus
  3. Plasmid
  4. Nucleoid

Answer: 4. Nucleoid

Question 95. Which of the following is present in the prokaryotes?

  1. Nuclear envelope
  2. Golgi apparatus
  3. Mitochondria
  4. Ribosomes

Answer: 2. Ribosomes

Question 96. A Gram-negative bacteria differs from a Gram-positive bacteria in having

  1. Thick cell wall and is primarily made up of peptidoglycan
  2. A complex cell envelope made up of three layers
  3. The cell wall of 20-80 nm in thickness and also contains tightly bound technoid acids
  4. Absence of cell wall lipids

Answer: 4. Absence of cell wall lipids

Question 97. Which of the following antibiotics inhibits the cross-linking of peptidoglycan strands, thus causing the lysis of the bacterial cell?

  1. Penicillin
  2. Cephalosporin
  3. Chloromycetin
  4. Both (1) and (2)

Answer: 2. Cephalosporin

Question 98. The pentacyclic sterol like molecules that stabilize the bacterial cell membrane are called as

  1. Cholesterol
  2. Hopanoids
  3. Spectrin
  4. Glycophorins

Answer: 4. Glycophorins

Question 99. Glycocalyx or cell coat which functions as the cell recognition center is made up of

  1. Proteins
  2. Lipids
  3. Proteins and lipids
  4. Glycoproteins and glycolipids

Answer: 4. Glycoproteins and glycolipids

Question 100. The plasma membrane is asymmetric because

  1. Lipids present in the outer and inner sides of the bilayer are different.
  2. Extrinsic proteins are more abundant on the inner surface than on the outer surface.
  3. Oligosaccharides are attached only to the external surface of lipids and proteins of a biomembrane.
  4. All of these

Answer: 3. Oligosaccharides are attached only to the external surface of lipids and proteins of a biomembrane

Question 101. Components of the eukaryotic plasma membrane are

  1. Proteins and lipids
  2. Proteins and carbohydrates
  3. Lipids (20-79%), proteins (20-70%), oligosaccharides (1-5%), and water (20%)
  4. Lipids (20-70%), proteins (20-79%), carbohydrates (1-5%), and DNA

Answer: 3. Lipids (20-79%), proteins (20-70%), oligosaccharides (1-5%), and water (20%)

Question 102. The unit membrane concept was proposed by

  1. Danielli
  2. Davson
  3. Robertson
  4. Both (1) and (2)

Answer: 3. Robertson

Question 103. The universally accepted model of the plasma membrane is

  1. Lamellar model
  2. Unit membrane model
  3. Fluid mosaic model
  4. Overton model

Answer: 2. Unit membrane model

Question 104. According to the fluid mosaic model of the plasma membrane, extrinsic proteins are

  1. Superficially arranged and cannot be separated easily
  2. Peripheral proteins are loosely connected to membranes and, therefore, can be easily removed in an aqueous medium
  3. Integral proteins which project beyond the lipid layer on both sides of the membrane and are considered as channel proteins
  4. Tightly attached to lipids and cannot be separated

Answer: 2. Peripheral proteins and are loosely connected to membranes and, therefore, can be easily removed in aqueous medium

Question 105. According to the widely accepted “fluid mosaic model,” cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect?

  1. Proteins in cell membranes can travel within the lipid bilayer.
  2. Proteins can also undergo flip-flop movements in the lipid bilayer.
  3. Proteins can remain confined within certain domains of the membranes.
  4. Many proteins remain completely embedded within the lipid bilayer.

Answer: 4. Many proteins remain completely embedded within the lipid bilayer.

Question 106. Fluid mosaic model of cell membrane proposes

  1. A lipid bilayer with embedded proteins only
  2. A lipid bilayer with proteins on the outer surface only
  3. A lipid bilayer coated with proteins on both surfaces
  4. A lipid bilayer with proteins of two types, embedded (intrinsic) and superficial (extrinsic)

Answer: 1. A lipid bilayer with embedded proteins only

Question 107. Out of proteins, lipids, and carbohydrates present in a “cell membrane,’

  1. Carbohydrates are minimum
  2. Carbohydrates are maximum
  3. Lipids are minimum
  4. All three are in equal proportion

Answer: 1. Carbohydrates are minimum

Question 108. Carrier molecules facilitating transport across cell mem-brane are

  1. Proteinaceous
  2. Fatty acids
  3. Starch
  4. Alkaloids

Answer: 3. Starch

Question 109. “Protein icebergs in a sea of lipids” means

  1. Unit membrane concept
  2. Sandwich model
  3. Fluid mosaic model
  4. None of these

Answer: 2. Sandwich model

Question 110. Extrinsic and intrinsic proteins found in the plasma membrane are in the ratio

  1. 70:30
  2. 30:70
  3. 40:60
  4. 60:40

Answer: 4. 60:40

Question 111. The main function of the plasma membrane is to

  1. Store cell material
  2. Control all cellular activities
  3. Maintain cell shape and size
  4. Regulate the inflow and outflow of material through the cell wall

Answer: 4. Regulate the inflow and outflow of material through the cell wall

Question 112. The plasma membrane is more permeable to

  1. Polysaccharides
  2. Proteins
  3. Glycoproteins
  4. Phospholipids

Answer: 1. Polysaccharides

Question 113. Plasma membrane, particularly in animal cells, is elastic due to

  1. Lipids
  2. Proteins
  3. Carbohydrates
  4. None of these

Answer: 4. None of these

Question 114. In the ultrastructure of cell membrane and its functions,

  1. Phospholipids are more than carbohydrates for signal.
  2. Proteins are less than carbohydrates for fluidity.
  3. The amount of phospholipids is highly variable for the transport of hydrophilic molecules.
  4. The amount of protein is unequally distributed in the membrane for better transport.

Answer: 4. The amount of protein is unequally distributed in the membrane for better transport.

Question 115. Two basic components of the cytoskeleton are

  1. Actin and myosin
  2. Tubulin and myosin
  3. Tubulin and actin
  4. All of these

Answer: 1. Actin and myosin

Question 116. Hydrolytic enzymes are abundantly found in which cell organelles?

  1. Ribosome
  2. Lysosome
  3. Oxysome
  4. Endoplasmic reticulum

Answer: 2. Lysosome

Question 117. Which of the following is the site of lipid synthesis

  1. Rough ER
  2. Smooth ER
  3. Golgi bodies
  4. Ribosome

Answer: 2. Smooth ER

Question 118. Ribosomes are produced in

  1. Nucleolus
  2. Cytoplasm
  3. Mitochondria
  4. Golgi body

Answer: 1. Nucleolus

Question 119. Which of the following pairs lack the unit membrane

  1. Nucleus and ER
  2. Mitochondria and Chloroplast
  3. Ribosome and nucleolus
  4. Golgi body and lysosome

Answer: 3. Ribosome and nucleolus

Question 120. Golgi body is concerned with

  1. Respiration
  2. Secretion
  3. Excretion
  4. Degradation

Answer: 2. Secretion

Question 121. Which of the following occurs more than one and less than five in a chromosome?

  1. Chromatid
  2. Chromomere
  3. Centromere
  4. Telomere

Answer: 4. Telomere

Question 122. The cells without nuclei arc present in

  1. Vascular cambium
  2. Root hair
  3. Companion cell
  4. Members of the sieve tube

Answer: 4. Members of sieve tube

Question 123. A plant with a minimum number of chromosomes is

  1. Haplopappus gracilis
  2. Salix te/rasperma
  3. Poa
  4. Cynodon

Answer: 1. Haplopappus gracilis

Question 124. Heteropycnosis is exhibited by

  1. Autosome
  2. Chromatid body
  3. Nucleolus
  4. Sex chromosome

Answer: 4. Sex chromosome

Question 125. The main function of the lysosome is

  1. Sexual reproduction
  2. Extracellular digestion
  3. Intracellular digestion
  4. Both (2) and (3)

Answer: 4. Both (2) and (3)

Question 126. Which of the following maintains continuity between the water and lipid phases inside and outside the cells?

  1. Cell wall
  2. Lecithin
  3. Cell vacuole
  4. Cell membrane of woody plants

Answer: 2. Lecithin

Question 127. The membrane surrounding cell vacuole is called

  1. Tonoplast
  2. Cell wall
  3. Plasma membrane
  4. Cell membrane

Answer: 1. Tonoplast

Question 128. The diagrammatic representation of chromosomes is known as

  1. Idiogram
  2. Karyotype
  3. Holotype
  4. Homotype

Answer: 1. Idiogram

Question 129. Thread-like structures that are composed of nuclear DNA of eukaryotic cells and are carriers of genetic information are known as chromosomes. The tenn “chromosome” was given by

  1. Waldeyer
  2. Balbiani
  3. Purkinje
  4. Sutton

Answer: 1. Waldeyer

Question 130. Chromosomes present in prolonged prophase in the salivary glands of Drosophila are

  1. Polytene chromosomes
  2. b-chromosomes
  3. Lampbrush chromosomes
  4. Supernumerary chromosomes

Answer: 1. Polytene chromosomes

Question 131. Chromosomes at anaphase are of various shapes due to the position of

  1. S and M phase
  2. G1 and S phase
  3. Centromere
  4. DNA

Answer: 3. Centromere

Question 132. The term “nucleosome” was given by Oudet. Olins and olins called these particles as “nu” particles. Which histone is absent in nucleosome?

  1. H1
  2. H2
  3. H3a
  4. H4

Answer: 3. H3a

Question 133. Nucleosome gives a beaded appearance to chromosomes. They help in the packing of DNA in chromosomes. A nucleosome has

  1. About 2 turns of DNA
  2. 8 histone molecules of 4 types (2 mols each of H2a, H2b, H3, and H4)
  3. 200 nitrogen base pairs
  4. All of the above

Answer: 4. All of the above

Question 134. Salivary gland chromosomes were discovered by Balbiani (1881) from the salivary glands of larva of

  1. Chironomus
  2. Drosophila
  3. Silkworm
  4. Lac worm

Answer: 1. Chironomus

Question 135. In SAT chromosomes, SAT (satellite) is the terminal part of chromosomes beyond secondary constriction. It contains

  1. DNA
  2. RNA
  3. Repetitive DNA
  4. None of these

Answer: 3. Repetitive DNA

Question 136. Material exchange through nucleopores is facilitated by

  1. Lamina propria
  2. lipid layer
  3. Nucleoplasmin
  4. Nucleolus

Answer: 3. Nucleoplasmin

Question 137. Centriole is

  1. Microtubular and membranes
  2. Absent in Amoeba, red algae, blue-green algae, conifers, and angiosperms and is made up of peripheral triplet microtubules
  3. Basically locomotory and their role in spindle formation is secondary
  4. All of the above

Answer: 4. All of the above

Question 138. The association of m-RNA with several ribosomes is called

  1. Polysome
  2. Informosome
  3. Both (1) and (2)
  4. None of these

Answer: 1. Polysome

Question 139. The Lampbrush chromosome is found in

  1. Oocyte of amphibians
  2. The salivary gland of a mosquito
  3. Silk gland of silkworm
  4. None of the above

Answer: 1. Oocyte of amphibians

Question 140. Prokaryotic ribosomes me

  1. 50S
  2. 60s
  3. 70S
  4. 80S

Answer: 3. 70S

Question 141. Mesosomes of prokaryotes perform functions similar to

  1. Mitochondria
  2. Peroxysomes
  3. Lysosomes
  4. Ribosomes

Answer: 1. Mitochondria

Question 142. RLR is rough because of the presence of

  1. Volutin granules on its surface
  2. Ribosomes on its surface
  3. Lysosomes on its surface
  4. Mitochondria on its surface

Answer: 2. Ribosomes on its surface

Question 143. Cellular recognition is facilitated by the components of the plasma membrane. These components are generally

  1. Protein molecules alone
  2. Lipid molecules alone
  3. Both lipid and protein molecules
  4. Glycolipids and glycoproteins

Answer: 4. Glycolipids and glycoproteins

Question 144. Which among the following can be seen only under electron microscope?

  1. Chloroplast
  2. Ribosome
  3. Leucoplast
  4. Nucleus

Answer: 2. Ribosome

Question 145. A mature plant cell has

  1. Cell wall and protoplasm
  2. Protoplasm and vacuole
  3. Vacuole and cell wall
  4. Protoplasm cell wall and vacuole

Answer: 4. Protoplasm cell wall and vacuole

Question 146. The larger sub-unit in 80S ribosome is

  1. 50S
  2. 60S
  3. 40S
  4. 0S

Answer: 2. 60S

Question 147. Golgi bodies are absent in

  1. Plants
  2. Bacteria
  3. Animals
  4. Eukaryotic cells

Answer: 2. Bacteria

Question 148. The endoplasmic reticulum is more developed in

  1. Green cells
  2. Young cells
  3. Mature cells
  4. Bacteriophages

Answer: 2. Young cells

Question 149. Mitochondria are related to

  1. Prokaryotic cells
  2. Plasmids
  3. Prion
  4. Virus

Answer: 1. Prokaryotic cells

Question 150. The main function of lysosomes is

  1. Digestion
  2. Replication
  3. Translation
  4. Translocation

Answer: 1. Digestion

Question 151. Which of the following has a single membrane?

  1. Ribosome
  2. Peroxisome
  3. Nucleus
  4. Centrosome

Answer: 2. Peroxisome

Question 152. L-shaped chromosomes are called

  1. Sex-chromosomes
  2. Acrocentric chromosomes
  3. Telocentric chromosomes
  4. Sub-metacentric chromosomes

Answer: 4. Sub-metacentric chromosomes

Question 153. Who coined the term chromosome?

  1. Balbiani
  2. Waldeyer
  3. Sutton
  4. Purkinje

Answer: 2. Waldeyer

Question 154. A chromosome having a sub-terminal centromere is called

  1. Telocentric chromosome
  2. Acrocentric chromosome
  3. Metacentric chromosome
  4. Sub-metacentric chromosome

Answer: 2. Acrocentric chromosome

Question 155. How many types of cells are known?

  1. One
  2. Two
  3. Three
  4. Four

Answer: 2. Two

Question 156. In which of the following microorganisms, mitosis does not occur?

  1. Green algae
  2. Fungi
  3. Bacteria
  4. Higher plants

Answer: 3. Bacteria

Question 157. A mature plant cell has

  1. Cell wall
  2. Vacuole
  3. Protoplasm
  4. All of the above

Answer: 4. All of the above

Question 158. In eukaryotic cells, the type of ribosomes is

  1. Only 70S
  2. Only 80S
  3. 70S and 80S both
  4. Only 50S

Answer: 3. 70S and 80S both

Question 159. The genetic material of prokaryotic cells is called

  1. Nucleus
  2. Nucleolus
  3. Nucleoid
  4. Centrosome

Answer: 3. Nucleoid

Question 160. Which organelle of plant cells secret polysaccharide to make cell walls?

  1. Golgi-bodies
  2. Lysosome
  3. Mitochondria
  4. Chloroplast

Answer: 1. Golgi-bodies

Question 161. RNA contains which of the following bases in place of thymine of DNA?

  1. Thymine
  2. Uracil
  3. Adenine
  4. None of these

Answer: 2. Uracil

Question 162. The main function of lysosomes is

  1. Only intracellular digestion
  2. Only extracellular digestion
  3. Both intracellular and extracellular digestions
  4. None

Answer: 3. Both intracellular and extracellular digestions

Question 163. A eukaryotic cell has

  1. Single chromatin fiber
  2. Definite nucleus
  3. Incipient nucleus
  4. None of these

Answer: 2. Definite nucleus

Question 164. The synthesis of lipids and proteins is associated with

  1. Endoplasmic reticulum
  2. Mitochondria
  3. Chloroplast
  4. Lysosomes

Answer: 1. Endoplasmic reticulum

Question 165. Cell theory was proposed by

  1. Schleiden and Schwann
  2. Watson and Crick
  3. Darwin and Wallace
  4. Mendel and Morgan

Answer: 1. Schleiden and Schwann

Question 166. Which one of the following is not found in animal cell?

  1. Nucleus
  2. Golgi bodies
  3. Chloroplast
  4. Mitochondria

Answer: 3. Chloroplast

Question 167. Unit membrane consists of

  1. Lipid + Sugar + Lipid
  2. Protein + Lipid + Protein
  3. Lipid + Protein + Lipid
  4. Protein

Answer: 2. Protein + Lipid + Protein

Question 168. The principal constituents of chromosomes are

  1. DNA +Protein
  2. DNA
  3. RNA
  4. RNA

Answer: 1. DNA +Protein

Question 169. The shape of the chromosome is determined by

  1. Telomere
  2. Centromere
  3. Chromomere
  4. Centrosome

Answer: 2. Centromere

Question 170. In a bacterial cell, the respiratory enzymes are found in

  1. Mitochondria
  2. Chondriosome
  3. Mesosome
  4. Centrosome

Answer: 3. Mesosome

Question 171. The cell wall of Spirogyra is made up of

  1. Cellulose
  2. Suberin
  3. Lignin
  4. Chitin

Answer: 1. Cellulose

Question 172. The main function of the Golgi complex is

  1. Translocation
  2. Phosphorylation
  3. Glyco-oxidation
  4. Fermentation

Answer: 1. Translocation

Question 173. In cell division, spindle fibers are made up of protein

  1. Myoglobin
  2. Tubulin
  3. Albumin
  4. Myosin

Answer: 2. Tubulin

Question 174. Choose the incorrect match.

  1. Nucleus—RNA
  2. Lysosome—Protein synthesis
  3. Mitochondria—Respiration
  4. Cytoskeleton—Microtubules

Answer: 2. Lysosome—Protein synthesis

Question 175. Rough endoplasmic reticulum is associated with

  1. Fat synthesis
  2. Steroid synthesis
  3. Protein synthesis
  4. All of these

Answer: 3. Protein synthesis

Question 176. The resolving power of an electron microscope is

  1. 10
  2. 105
  3. 1005
  4. 10005

Answer: 2. 105

Question 177. The number of barr bodies in XXXXY is

  1. 1
  2. 2
  3. 3
  4. 4

Answer: 3. 3

Question 178. The study related to the structure and function of a cell is called as

  1. Physiology
  2. Cell Biology
  3. Histology
  4. Cytology

Answer: 2. Cell biology

Question 179. The fluid mosaic model was given by

  1. Knoll and Ruska
  2. Singer and Ruska
  3. Singer and Nicolson
  4. Bateson and Punnet

Answer: 3. Singer and Nicolson

Question 180. The characteristic of blue-green algae is

  1. DNA without histone
  2. Nucleus absent
  3. Nuclear membrane absent
  4. All of the above

Answer: 4. All of the above

Question 181. The cell wall of a cell is removed. The remaining is called

  1. Etioplast
  2. Aleuroplast
  3. Amyloplast
  4. Protoplast

Answer: 4. Protoplast

Question 182. The movement against the concentration gradient is called

  1. Osmosis
  2. Active transport
  3. Diffusion
  4. Passive transport

Answer: 2. Active transport

Question 183. Which one is present in both prokaryotic and eukaryotic cells?

  1. Ribosome
  2. Mitochondria
  3. ER
  4. Nucleus

Answer: 1. Ribosome

Question 184. Centromere is also called

  1. Chromomere
  2. Secondary constriction
  3. Primary constriction
  4. Chromonema

Answer: 3. Primary constriction

Question 185. In Singer and Nicolson’s model of the plasma membrane, the extrinsic proteins are

  1. Tightly associated with intrinsic protein and can be easily separated
  2. Loosely associated with intrinsic protein
  3. Loosely associated with intrinsic protein and can be easily separated
  4. Loosely associated with intrinsic protein and cannot be easily separated

Answer: 3. Loosely associated with intrinsic protein and can be easily separated

Question 186. Ribosomes are associated with

  1. RNA synthesis
  2. Protein synthesis
  3. Enzyme mobilization
  4. DNA synthesis

Answer: 2. Protein synthesis

Question 187.  Which organelle is not found in an animal cell?

  1. Peroxisome
  2. Ribosome
  3. Lysosome
  4. None of these

Answer: 4. None of these

Question 188. Actin fiber is present in

  1. Cilia
  2. Flagella
  3. Carbohydrate
  4. Microfilaments

Answer: 4. Microfilaments

Question 189. Meiosis can be observed in

  1. Tapetal cells
  2. Megaspores
  3. Micropores
  4. Spore mother cells

Answer: 4. Spore mother cells

Question 190. Carrier proteins are involved in

  1. Transport of enzymes
  2. Water transport
  3. Active transport of ions
  4. Passive transport of gases

Answer: 3. Active transport of ions

Question 191. The recent model for plasma membrane proposed by Singer and Nicolson is

  1. Molecular lipid model
  2. Lamellar model
  3. Unit membrane model
  4. Fluid mosaic model

Answer: 4. Fluid mosaic model

Question 192. The function of mitochondria is

  1. Excretion
  2. Respiration
  3. Digestion
  4. Excretion and respiration

Answer: 2. Respiration

Question 193. The term basal body is associated with the development of

  1. Cilia and flagella
  2. Cell plate
  3. Phragmoplast
  4. Kinetochore

Answer: 1. Cilia and flagella

Question 194. The Golgi body originates form

  1. Lysosome
  2. Endoplasmic reticulum
  3. Mitochondria
  4. Cell membrane

Answer: 2. Endoplasmic reticulum

Question 195. Lipid molecules in the plasma membrane are arranged in which manner?

  1. Scattered
  2. Series
  3. Alternate
  4. Head parallel

Answer: 4. Head parallel

Question 196. The structure of the nuclear membrane helps in

  1. Organization of the spindle
  2. Synapsis of homologous chromosome
  3. Nucleo-cytoplasmic exchange of material
  4. Anaphasic separation of daughter chromosome

Answer: 3. Nucleo-cytoplasmic exchange of material

Question 197. Hydrolytic enzymes are stored in

  1. Golgi bodies
  2. Lysosomes
  3. Endoplasmic reticulum
  4. Mitochondria

Answer: 2. Lysosomes

Question 198. Ribosomes may be also called

  1. Microsome
  2. Dictyosomes
  3. Ribonucleoprotein
  4. Oxysomes

Answer: 3. Ribonucleoprotein

Question 199. Genes are present in

  1. Chromosomes
  2. Lamellae
  3. Plasma membrane
  4. Mesosomes

Answer: 1. Chromosomes

Question 200. The chromosome showing an L-shaped structure by the presence of a centromere is termed as

  1. Acentric
  2. Metacentric
  3. Sub-metacentric
  4. Telocentric

Answer: 3. Sub-metacentric

Question 201. Who coined the term “cell”?

  1. Purkinje
  2. Robert Brown
  3. Robert Hooke
  4. Hugo von Mold

Answer: 3. Robert Hooke

Question 202. Chromosome having centromere in its middle is called

  1. Acrocentric
  2. Telocentric
  3. Metacentric
  4. Submetacentric

Answer: 3. Metacentric

Question 203. Single membrane-bound organelle is

  1. Lysosome
  2. Plastid
  3. Nucleus
  4. Mitochondria

Answer: 1. Lysosome

Question 204. Which of the following does not possess a lipoproteinaceous membrane?

  1. Lysosomes
  2. Lomasomes
  3. Ribosomes
  4. Sphaerosomes

Answer: 3. Ribosomes

Question 205. Centrosome is not present in

  1. Cells of higher plants
  2. Cells of lower plants
  3. Cells of higher animals
  4. Cells of lower animals

Answer: 1. Cells of higher plants

Question 206. The site of protein synthesis is

  1. Ribosome
  2. SER
  3. Golgi bodies
  4. Lysosomc

Answer: 1. Ribosome

Question 207. To study the living cells without staining, which of the following microscopes can be used?

  1. SEM
  2. Florescent
  3. Phase contrast
  4. TEM

Answer: 3. Phase contrast

Question 208. Molecular biology is the study of

  1. Structure, function, and cell reproduction
  2. Physicochemical studies of biomolecules
  3. Studying tissues under a microscope
  4. Metabolic activity of life

Answer: 2. Physicochemical studies of biomolecules

Question 209. The sub-cellular components can be separated by

  1. Paper chromatography
  2. Autoradiography
  3. Gel electrophoresis
  4. Differential and density gradient centrifugation

Answer: 4. Differential and density gradient centrifugation

Question 210. The chromosome separation during metaphase can be best studied by

  1. Phase contrast microscope
  2. TEM
  3. X-ray technique
  4. Scanning electron microscope

Answer: 1. Phase contrast microscope

Question 211. The technique of chromatography was developed by

  1. Wilkins
  2. George Gey
  3. Tswett
  4. Zemicks

Answer: 3. Tswett

Question 212. Which of the following dye is used for staining cell organelle, and mitochondria?

  1. Janus Green
  2. Safranin
  3. Azure B
  4. Crystal violet

Answer: 1. Janus Green

Question 213. In the fluid mosaic model of the plasma membrane,

  1. Upper layer is non-polar and hydrophilic
  2. Polar layer is hydrophobic
  3. Phospholipids form a bimolecular layer in the middle part
  4. Proteins form a middle layer

Answer: 3. Phospholipids form a bimolecular layer in the middle part

Question 214. According to the widely accepted “fluid mosaic model,” cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect?

  1. Proteins can also undergo flip-flop movements in the lipid bilayer.
  2. Many proteins remain completely embedded within the lipid bilayer.
  3. Proteins in cell membranes can travel within the lipid bilayer.
  4. Proteins can remain confined within certain domains of the membranes.

Answer: 1. Proteins can also undergo flip-flop movements in the lipid bilayer.

Question 215. Which one of the following is not a constituent of cell membrane?

  1. Cholesterol
  2. Glycolipids
  3. Proline
  4. Phospholipids

Answer: 3. Proline

Question 216. The main organelle involved in the modification and rout¬ing of newly synthesized proteins to their destination is

  1. Endoplasmic reticulum
  2. Lysosomc
  3. Mitochondria
  4. Chloroplast

Answer: 1. Endoplasmic reticulum

Question 217. Chlorophyll in chloroplasts is located in

  1. Grana
  2. Pyrcnoid
  3. Stroma
  4. Both grana and stroma

Answer: 1. Grana

Question 218. Which of the following statements regarding mitochondrial membrane is not correct?

  1. The outer membrane resembles a sieve.
  2. The outer membrane is permeable to all kinds of molecules.
  3. The enzymes of the electron transfer chain are embedded in the outer membrane.
  4. The inner membrane is highly convoluted forming a series of infoldings.

Answer: 3. The enzymes of the electron transfer chain are embedded in the outer membrane

Question 219. Polysome is formed by

  1. A ribosome with several subunits
  2. Ribosomes attached to each other in a linear arrangement
  3. Several ribosomes attached to a single mRNA
  4. Many ribosomes attached to a strand of endoplasmic reticulum

Answer: 3. Several ribosomes attached to a single mRNA

Question 220. Vacuole in a plant cell

  1. Lacks membrane and contains air
  2. Lacks membrane and contains water and excretory substances
  3. Is membrane-bound and contains storage proteins and lipids
  4. Is membrane-bound and contains water and excretory substances

Answer: 4. Is membrane-bound and contains water and excretory substances

Question 221. In germinating seeds, fatty acids are degraded exclusively in the

  1. Peroxisomes
  2. Mitochondria
  3. Proplastids
  4. Glyoxysomes

Answer: 4. Glyoxysomes

Question 222. Keeping in view the fluid mosaic model for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as -flip-flop movement)?

  1. While proteins can flip-flop, lipids cannot.
  2. Neither lipids nor proteins can flip-flop.
  3. Both lipids and proteins can flip-flop.
  4. While lipids can rarely flip-flop, proteins cannot.

Answer: 4. While lipids can rarely flip-flop, proteins cannot.

Question 223. Three of the following statements regarding cell organelles are correct while one is wrong. Which one is wrong?

  1. Lysosomes are double-membraned vesicles budded off from the Golgi apparatus and contain digestive enzymes.
  2. The endoplasmic reticulum consists of a network of membranous tubules and helps in transport, synthesis, and secretion.
  3. Leucoplasts are bound by two membranes that lack pigment but contain their own DNA and protein-synthesizing machinery.
  4. Spharosomes are single membrane bonds and are associated with the synthesis and storage of lipids.

Answer: 1. Lysomes are double-membraned vesicles budded off from the Golgi apparatus and contain digestive enzymes.

Question 224. In which one of the following would you expect to find glyoxysomes?

  1. Endosperm of wheat
  2. Endosperm of castor
  3. Palisade cells in leaf
  4. Root hairs

Answer: 2. Endosperm of castor

Question 225. Which of the following statements regarding cilia is not correct?

  1. Cilia contain an outer layer of nine doublet microtubules surrounding two single microtubules.
  2. The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane.
  3. Cilia are hair-like cellular appendages.
  4. Microtubules of cilia are composed of tubulin.

Answer: 2. The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane.

Question 226. The contractile protein of skeletal muscle involving ATPase activity is

  1. Actinin
  2. Toponin
  3. Tropomyosin
  4. Myosin

Answer: 4. Myosin

Question 227. Select the wrong statement from the following:

  1. Both chloroplasts and mitochondria contain an inner and outer membrane.
  2. Both chloroplast and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane.
  3. Both chloroplasts and mitochondria contain DNA.
  4. The chloroplasts are generally much larger than mitochondria.

Answer: 2. Both chloroplast and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane.

Question 228. The telomeres of eukaryotic chromosomes consist of short sequences of

  1. Cytosine-rich repeats
  2. Adenine-rich repeats
  3. Guanine-rich repeats
  4. Thymine-rich repeats

Answer: 3. Guanine-rich repeats

Question 229. If you are provided with root tips of onion in your class and are asked to count the chromosomes, which of the following stages can your most conveniently look into

  1. Telophase
  2. Anaphase
  3. Prophase
  4. Metaphase

Answer: 4. Metaphase

Question 230. Protein synthesis in an animal cell occurs

  1. On ribosomes present in the cytoplasm as well as in mitochondria
  2. On ribosomes present in the nucleolus as well as in the cytoplasm
  3. Only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
  4. Only on the ribosomes present in cytosol

Answer: 1. On ribosomes present in the cytoplasm as well as in mitochondria

Question 231. Telomerase is an enzyme that is a

  1. RNA
  2. Ribonucleoprotein
  3. Repetitive DNA
  4. Simple protein

Answer: 1. RNA

Question 232. The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is the DNA accommodated?

  1. Deletion of non-essential genes
  2. Supper-coiling in nucleosomes
  3. DNase digestion
  4. Through the elimination of repetitive DNA

Answer: 2. Supper-coiling in nucleosomes

Question 233. Centromere is required for

  1. Movement of chromosomes towards poles
  2. Cytoplasmic cleavage
  3. Crossing over
  4. Transcription
  5. During entire prophase

Answer: 1. Movement of chromosomes toward poles

Question 234. Plasmodesmata are

  1. Connections between adjacent cells
  2. Lignified cemented layers between cells
  3. Locomotory structures
  4. Membranes connecting the nucleus with plasmalemma

Answer: 1. Connections between adjacent cells

Question 235. Middle lamella is composed mainly of

  1. Phosphoglycerides
  2. Hemicellulose
  3. Muramic acid
  4. Calcium pectate

Answer: 4. Calcium pectate

Question 236. Cytoskeleton is made up of

  1. Proteinaceous filaments
  2. Calcium carbonate granules
  3. Callose deposits
  4. Cellulosic microfibrils

Answer: 1. Proteinaceous filaments

Question 237. The cell junctions called tight, adhering, and gap junctions are found in

  1. Neural tissue
  2. Muscular tissue
  3. Connective tissue
  4. Epithelial tissue

Answer: 4. Epithelial tissue

Question 238. There is no DNA in

  1. Hair root
  2. An enucleated ovum
  3. Mature RBCs
  4. A mature spermatozoa

Answer: 3. Mature RBCs

Question 239. A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object which one of the following colors of light so as to get the best possible resolution.

  1. Yellow
  2. Green
  3. Red
  4. Blue

Answer: 3. Red

Question 240. A major breakthrough in the studies of cells came with the development of the electron microscope. This is because

  1. Electron beams can pass through thick materials, whereas light microscopy requires thin section.
  2. The electron microscope is more powerful than the light microscope as it uses a beam of electrons that have wavelengths much longer than that of photons.
  3. The resolution power of the electron microscope is much higher than that of the light microscope.
  4. The resolving power of the electron microscope is 200-350 nm as compared to 0.1-0.2 nm for the light microscope.

Answer: 3. The resolving power of the electron microscope is 200-350 nm as compared to 0.1-0.2 nm for the light microscope.

Question 241. The main area of various types of activities of a cell is

  1. Plasma membrane
  2. Mitochondrion
  3. Cytoplasm
  4. Nucleus

Answer: 3. Cytoplasm

Question 242. Carrier ions such as Na+ facilitate the absorption of substances such as

  1. Amino acids and glucose
  2. Glucose and fatty acids
  3. Fatty acids and glycerol
  4. Fructose and some amino acids

Answer: 4. Fructose and some amino acids

Question 243. The plasma membrane consists mainly of

  1. Phospholipids embedded in a protein bilayer
  2. Proteins embedded in a phospholipid bilayer
  3. Proteins embedded in a polymer of glucose molecules
  4. Proteins embedded in a carbohydrate bilayer

Answer: 2. Proteins embedded in a phospholipid bilayer

Question 244. An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called

Endoplasmic reticulum

  1. Plasmalemma
  2. Cytoskeleton
  3. Thylakoid

Answer: 3. Cytoskeleton

Question 245. Identify the components labeled A, B, C, and D from the list (1) to (8) given along with.

NEET Biology Cell The Unit Of Life Components Of Labbels

Components:

  1. Cristae of mitochondria
  2. Inner membrane of mitochondria
  3. Cytoplasm
  4. Smooth endoplasmic reticulum
  5. Rough endoplasmic reticulum
  6. Mitochondrial matrix
  7. Cell vacuole
  8. Nucleus

The correct components are:

NEET Biology Cell The Unit Of Life Components Labelled

Answer: 4

Question 246. What is true about ribosomes?

  1. These are composed of ribonucleic acid and proteins.
  2. These are found only in eukaryotic cells.
  3. These are self-splicing introns of some RNAs.
  4. The prokaryotic ribosomes are 80 S, where “S” stands for sedimentation coefficient.

Answer: 1. These are composed of ribonucleic acid and proteins.

Question 247. Select the correct statement from the following regarding cell membranes.

  1. Proteins make up 60 to 70% of the cell membrane.
  2. Lipids are arranged in a bilayer with polar heads toward the inner part.
  3. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.
  4. Na+ and K ions move across cell

Answer: 3. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.

Question 248. The correct sequence of cell organelles during photorespiration is

  1. Chloroplast—Rough endoplasmic reticulum—Dictyosomes
  2. Chloroplast—Mitochondria—Peroxisome
  3. Chloroplast—Vacuole—Peroxisome
  4. Chloroplast—Golgi bodies—Mitochondria

Answer: 2. Chloroplast—Mitochondria—Peroxisome

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