Cell The Unit of Life important Questions and Answers

Top 100 most important Questions and Answers on Cell The Unit of Life. Cell The Unit of Life Important Questions and Answers with FREE PDF are the most important part of Medical Entrance Exams like NEET, AIIMS, JIPMER and other Board Exams.

1 Which is not an example of transmembrane transport between different subcellular compartments?
(A) Transport from the stroma into thylakoid space
(B) Transport from the cytoplasm into the lumen of the endoplasmic reticulum
(C) Transport from the endoplasmic reticulum into the Golgi complex
(D) Transport from mitochondrial intermembrane space into the mitochondrial matrix

Answer: Transport from the endoplasmic reticulum into the Golgi complex
2 Which is correct regarding the peptides in the Ramachandran Plot?
(A) The sequence of the peptide can be deduced
(B) It is not possible to conclude whether a peptide adopts entirely helix or entirely beta-sheet conformation
(C) Peptides that are unstructured will have all the backbone dihedral angles in the disallowed regions
(D) The occurrence of a beta-turn conformation in a peptide can be deduced

Answer: The occurrence of a beta-turn conformation in a peptide can be deduced
3 The function of the centrosome is
(A) Formation of spindle fibres
(B) Osmoregulation
(C) Secretion
(D) Protein synthesis

Answer:Formation of spindle fibres
4 Which cell organelle is involved in apoptosis?
(A) Lysosome
(B) ER
(C) Golgi
(D) Mitochondria

Answer: Mitochondria
5 Phosphatidylserine residues in the plasma membrane are located at
(A) Inner leaflet of the plasma membrane
(B) The outer leaflet of the plasma membrane
(C) Evenly distributed in the inner and outer leaflet
(D) None

Answer: Inner leaflet of the plasma membrane
6 Distribution of intrinsic proteins in the plasma membrane is
(A) Random
(B) Symmetrical
(C) Asymmetrical
(D) None

Answer:Asymmetrical
7 Select a foodborne toxin
(A) Botulinum toxin
(B) Tetanus Toxin
(C) Diphtheria toxin
(D) Cholera Toxin

Answer:Botulinum toxin
8 This cell organelle is responsible for extracting energy from carbohydrates to form ATP
(A) Lysosome
(B) Ribosome
(C) Chloroplast
(D) Mitochondrion

Answer:Mitochondrion
9 Pick the incorrect statement
(A) Mycoplasma is a wall-less microorganism
(B) Pili and fimbriae are mainly involved in motility of bacterial cells
(C) The bacterial cell wall is made up of peptidoglycan
(D) Cyanobacteria lack flagellated cells

Answer: Mycoplasma is a wall-less microorganism
10 As per the Fluid Mosaic model, plasma membrane is composed of
(A) phospholipids and integral proteins
(B) phospholipids, extrinsic proteins, and intrinsic proteins
(C) phospholipids and hemicellulose
(D) phospholipids and oligosaccharides

Answer: phospholipids, extrinsic proteins, and intrinsic proteins
11 Select the wrong statement from the following
(A) The chloroplasts are generally much larger than mitochondria
(B) Both chloroplast and mitochondria contain an inner and outer membrane
(C) Both chloroplast and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane
(D) Both chloroplast and mitochondria contain DNA

Answer:Both chloroplast and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane
12 Which one of the following statements regarding mitochondrial membrane is not correct?
(A) The outer membrane is permeable to all kinds of molecules
(B) The enzymes of the electron transfer chain are embedded in the outer membrane
(C) The inner membrane is highly convoluted forming a series of inflodings
(D) The outer membrane resembles a sieve

Answer: The enzymes of the electron transfer chain are embedded in the outer membrane
13 A major breakthrough in the studies of cells came which the development of electron microscope. This is because
(A) The resolution power of the electron microscope is much higher than that of light microscope
(B) The resolving power of the electron microscope is 200-350nm as compared to 0.1-0.2 nm for the light microscope
(C) Electron beam can pass through thick materials whereas light microscopy requires thin sections
(D) The electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons

Answer: The resolution power of the electron microscope is much higher than that of light microscope
14 The term “Glycocalyx” is used for
(A) A layer surrounding the cell wall of bacteria
(B) A layer present between cell wall and membrane of bacteria
(C) Cell wall of bacteria
(D) Bacterial cell genetically engineered to possess N-glycosylated proteins

Answer: A layer surrounding the cell wall of bacteria
15 Why is a capsule advantageous to a bacteria?
(A) It allows the bacterium to attach to the surface
(B) To protect bacterium from desiccation
(C) It provides means of locomotion
(D) It allows bacterium to hide from host’s immune system

Answer: It allows bacterium to hide from host’s immune system
16 Which one of the following organisms is not an example of eukaryotic cells
(A) Amoeba proteus
(B) Paramoecium caudatium
(C) Escherichia coli
(D) Euglena viridis

Answer: Escherichia coli
17 The main organelle involved in modification and routing of newly synthesized proteins to the destination is
(A) Mitochondria
(B) ER
(C) Lysosome
(D) Chloroplast

Answer: ER
18 A student wishes to study the cell structure under a light microscope having 10X eyepieace and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution
(A) Yellow
(B) Green
(C) Blue
(D) Red

Answer:Blue
19 Chlorophyll in chloroplasts is located in
(A) Grana
(B) Pyrenoid
(C) Stroma
(D) Both (1) and (2)

Answer: Grana
20 Protein synthesis in animal cell occurs
(A) Only on the ribosomes present in cytosol
(B) Only ribosomes present in cytoplasm as well as in mitochondria
(C) Only on ribosomes attached to the nuclear envelope and ER
(D) On ribosomes present in the nucleolus as well as in cytoplasm

Answer:Only ribosomes present in cytoplasm as well as in mitochondria
21 The chromosome in which centromere is located close to one end are
(A) Sub-metacentric
(B) Metacentric
(C) Acrocentric
(D) Telocentric

Answer:Acrocentric
22 A somatic cell that has just completed the S-phase of its cell cycle, as compared to gamete of the same species, has
(A) Four times the number of chromosomes and twice the amount of DNA
(B) Twice the number of chromosomes and twice the amount of DNA
(C) Same number of chromosomes and twice the amount of DNA
(D) Twice the number of chromosomes and 4 times the amount of DNA

Answer:Twice the number of chromosomes and 4 times the amount of DNA
23 Which structure performs the function of mitochondria in bacteria
(A) Nucleoid
(B) Ribosomes
(C) Cell wall
(D) Mesosome

Answer: Mesosome
24 Golgi complex plays a major role
(A) In digesting proteins and carbohydrates
(B) As energy transferring organelle
(C) In post translational modification of proteins and glycosidation of lipids
(D) In trapping the light and transforming it into chemical energy

Answer: In post translational modification of proteins and glycosidation of lipids
25 Which one of the following does not differ in E. coli and chlamydomonas
(A) Cell wall
(B) Cell membrane
(C) Ribosomes
(D) Chromosomal organization

Answer: Cell membrane
26 Select the correct statement from the following regarding cell membrane
(A) Lipids are arranged in a bilayer with polar heads towards the inner part
(B) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson
(C) Na+ and K+ move across the cell membrane by passive transport
(D) Proteins make up 60-70% of the cell membrane

Answer:Fluid mosaic model of cell membrane was proposed by Singer and Nicolson
27 What is true about ribosomes
(A) These are found only in eukaryotic cells
(B) These are self-splicing introns of some RNAs
(C) The prokaryotic ribosomes are 80S, where “S” stands for sedimentation coefficient
(D) These are composed of ribonucleic acid and proteins

Answer: These are composed of ribonucleic acid and proteins
28 Ribosomal RNA is actively synthesized in
(A) Nucleoplasm
(B) Ribosomes
(C) Lysosomes
(D) Nucleolus

Answer:Nucleolus
29 Important site for the formation of glycoproteins and glycolipids is
(A) Ribosomes
(B) Golgi apparatus
(C) Plastids
(D) Vacuoles

Answer: Golgi apparatus
30 Peptide synthesis inside a cell takes place in
(A) Ribosomes
(B) Chloroplasts
(C) Mitochondria
(D) Chromoplast

Answer: Ribosomes
31 Pick the correct statement from these regarding the cell membrane
(A) Lipids are arranged in a bilayer with polar heads towards the inner part
(B) Na+ and K+ ions move across cell membrane by passive transport
(C) Fluid mosaic model of the cell membrane was proposed by Singer and Nicolson
(D) Proteins make up 60-70% of cell membrane

Answer:Fluid mosaic model of the cell membrane was proposed by Singer and Nicolson
32 This structure between two adjacent cells is an effective transport pathway
(A) Plasmalemma
(B) Plastoquinones
(C) Plasmodesmata
(D) Endoplasmic reticulum

Answer: Plasmodesmata
33 Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on
(A) proton gradient
(B) accumulation of Na ions
(C) accumulation of K ions
(D) membrane potential

Answer:proton gradient
34 The telomeres of eukaryotic chromosomes consist of short sequences of
(A) guanine rich repeats
(B) thymine rich repeats
(C) cytosine rich repeats
(D) adenine rich repeats

Answer:guanine rich repeats
35 Cellular totipotency is demonstrated by
(A) only bacterial cells
(B) all eukaryotic cells
(C) all plant cells
(D) only gymnosperm cells

Answer: all plant cells
36 This ribosome is engaged in protein synthesis in animal cell
(A) Ribosomes of only cytosol
(B) Ribosomes which occur on nuclear membrane and ER
(C) Ribosomes of only mitochondria and cytosol
(D) Ribosomes of only nucleolus and cytosol

Answer: Ribosomes which occur on nuclear membrane and ER
37 This statement on cilia is incorrect
(A) Microtubules of cilia are composed of tubulin
(B) The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane
(C) Cilia contains an outer ring of nine doublet microtubules surrounding two singlet microtubules
(D) Cilia are hair-like cellular appendages

Answer: The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane
38 According to fluid mosaic model, plasma membrane is composed of
(A) phospholipids and oligosaccharides
(B) phospholipids and hemicellulose
(C) phospholipids and intergral proteins
(D) phospholipids, extrinsic proteins and intrinsic proteins

Answer:phospholipids, extrinsic proteins and intrinsic proteins
39 A bivalent consists of
(A) two chromatids and one centromere
(B) two chromatids and two centromeres
(C) four chromatids and two centromweres
(D) four chromatids and four centromeres

Answer: four chromatids and two centromweres
40 Additional of new cell wall particles amongst the existing ones is
(A) deposition
(B) apposition
(C) aggregation
(D) intussusception

Answer: intussusception
41 Mitochondria and chloroplast are
a) Semi-autonomous organelles
b) Formed by division of the pre-existing organelles and they contain DNA but lack protein synthesizing machinery
Which one of the following options is correct?
(A) Both (a) and (b) are correct
(B) Both (a) and (b) are false
(C) (b) is true but (a) is false
(D) (a) is true but (b) is false

Answer:(a) is true but (b) is false
42 Which of the following structures are not found in prokaryotic cells
(A) Plasma membrane
(B) Nuclear envelope
(C) Ribosome
(D) Mesosome

Answer: Nuclear envelope
43 Which of the following are not membrane bound organelles
(A) Mesosome
(B) Vacuoles
(C) Lysosome
(D) Ribosome

Answer:Ribosome
44 Cellular organelles with membranes are
(A) Lysosome, Golgi apparatus and mitochondria
(B) Nuclei, ribosomes and mitochondria
(C) Chromosomes, ribosomes and ER
(D) ER, ribosomes and Nuclei

Answer:Lysosome, Golgi apparatus and mitochondria
45 Balbiani rings are sites of
(A) RNA and Protein synthesis
(B) Lipid synthesis
(C) Nucleotides synthesis
(D) Polysaccharide synthesis

Answer: RNA and Protein synthesis
46 In photosynthesis, the light independent reactions take place at
(A) Stomatal matrix
(B) Thylakoid lumen
(C) Photosystem I
(D) Photosystem II

Answer: Stomatal matrix
47 Nuclear envelop is a derivative of
(A) RER
(B) SER
(C) Membrane of Golgi complex
(D) Microtubules

Answer: RER
48 Which one of the following is not an inclusion body found in prokaryotes?
(A) Polysome
(B) Phosphate granule
(C) Cyanophycean granule
(D) Glycogen granule

Answer:Polysome
49 The oxygen and carbon dioxide crosses the plasma membrane by the process of
(A) Active diffusion
(B) Facilitated diffusion
(C) Passive diffusion
(D) Random diffusion

Answer:Passive diffusion
50 A cell without a cell wall is termed as
(A) Tonoplast
(B) Protoplast
(C) Symplast
(D) Apoplast

Answer: Protoplast
51 Experiments on Acetabularia by Hammerling proved ones is
(A) cytoplasm in controlling differentiation
(B) nucleus in heredity
(C) chromosomes in heredity
(D) nucleus cytoplasmic ratio

Answer: nucleus in heredity
52 Which is correct about cell theory in view of current status of our knowledge about cell structure
(A) cell theory means that all living objects consissts of cells wheather or not capable of reproducing
(B) it needs modification due to discovery of subcellular structures like chrorplasts and mitochondria
(C) cell theory does not hold good because all living beings( eg., viruses) do not have capable of reproducing
(D) modified cell theory means that all living beings are composed of cells capable of reproducing

Answer: cell theory does not hold good because all living beings( eg., viruses) do not have capable of reproducing
53 Golgi apparatus is absent in
(A) higher plants
(B) yeast
(C) bacteria and blue green algae
(D) none of the above

Answer: higher plants
54 In plant cells, peroxisomes are associated with
(A) photorespiration
(B) phototropism
(C) photoperiodism
(D) photosynthesis

Answer: photorespiration
55 Balbiani rings (puffs) are sites of
(A) DNA replication
(B) RNA and protein synthesis
(C) synthesis of lipids
(D) synthesis of polysaccharides

Answer: RNA and protein synthesis
56 The prokaryotic flagella possess
(A) unit membrane enclosed fibre
(B) protein membrane enclosed fibre
(C) 9+2 membrane enclosed fibre
(D) helically arranged protein molecule

Answer:helically arranged protein molecule
57 The mechanism of ATP formation both in chloroplasts and mitochondria is explained by
(A) chemiosmotic theory
(B) Munch’s hypothesis (mass flow model)
(C) relay pump theory of Godlewski
(D) Cholodny Wont’s model

Answer: Cholodny Wont’s model
58 Select the mismatch:
(A) Gas vacuoles – Green Bacteria
(B) Large central vacuoles – Animal cells
(C) Protists – Eukaryotes
(D) Methanogens – Prokaryotes

Answer:Large central vacuoles – Animal cells
59 A cell organelle containing hydrolytic enzymes is
(A) Lysosome
(B) Microsome
(C) Ribosome
(D) Mesosome

Answer: Lysosome
60 Water soluble pigments found in plant cell vacuoles are
(A) Anthocyanin
(B) Xanthophyll
(C) Chlorophyll
(D) Carotenoids

Answer: Anthocyanin
61 In eubacteria, a cellular component that resembles eukaryotic cell is
(A) Cell wall
(B) Plasma membrane
(C) Nucleus
(D) Ribosomes

Answer: Plasma membrane
62 In mitochondria protons accumulate in the
(A) Inter membrane space
(B) Matrix
(C) Outer membrane
(D) Inner membrane

Answer: Inter membrane space
63 Which one of the following is not considered as part of endomembrane system
(A) Vacuole
(B) Lysosome
(C) Golgi complex
(D) Peroxisome

Answer: Peroxisome
64 The main arena of various types activities of a cell is
(A) Nucleus
(B) Plasma membrane
(C) Mitochondria
(D) Cytoplasm

Answer: Cytoplasm
65 The plasma membrane consists of mainly
(A) Proteins embedded in the carbohydrate bilayer
(B) Phospholipids embedded in protein bilayer
(C) Proteins embedded in phospholipid layer
(D) Proteins embedded in a polymer of glucose molecules

Answer:Proteins embedded in phospholipid layer
66 Which one of the following statements about the particular entity is true?
(A) Centromere if found in animal cells, which produces ester during cell divisions
(B) The gene for producing insulin is present in every body cell
(C) Nucleosome is formed of nucleotides
(D) DNA consists of a core of 8 Histones

Answer: The gene for producing insulin is present in every body cell
67 Plasmodesmata are
(A) Locomotory structures
(B) Membranes connecting the nucleus with plasma lemma
(C) Connections between adjacent cells
(D) Lignified cemented layers between the cells

Answer: Connections between adjacent cells
68 Polysome is formed by
(A) Ribosomes attached to each other in a linear arrangement
(B) Several ribosomes attached to a single mRNA strand
(C) Many ribosomes attached to a strand of ER
(D) A ribosome with several subunits

Answer: Several ribosomes attached to a single mRNA strand
69 Keeping in view the ‘fluid mosaic model’ for the structure of cell membrane, which one of the following statements is correct w.r.t. the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?
(A) Neither lipids nor proteins can flip-flop
(B) Both lipids and proteins can flip flop
(C) While lipids can rarely flip flop, proteins cannot
(D) While proteins can rarely flip flop, lipids cannot

Answer: While lipids can rarely flip flop, proteins cannot
70 Which one of the following is not a constituent of cell membrane
(A) Phospholipids
(B) Cholesterol
(C) Glycolipids
(D) Proline

Answer: Proline
71 According to 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 aspects. In this regard, which one of the following statements is incorrect?
(A) Proteins in cell membranes can travel within the lipid bilayer
(B) Proteins can remain confined within certain domains of the membrane
(C) Proteins can also undergo “Flip-flop movements” in lipid bilayer
(D) Many proteins remain completely embedded within the lipid bilayer

Answer: Proteins can also undergo “Flip-flop movements” in lipid bilayer
72 Which of the following statements regarding cilia is not correct
(A) The organized beating of cilia is controlled by fluxes of Ca+ across the membrane
(B) Cilia are hair-like cellular appendages
(C) Microtubules of cilia are composed of tubule
(D) Cilia contain an outer ring of nine doublet microtubules surrounding two single microtubules

Answer: The organized beating of cilia is controlled by fluxes of Ca+ across the membrane
73 In germinating seeds fatty acids are degraded exclusively in
(A) Mitochondria
(B) Proplastids
(C) Glyoxysomes
(D) Peroxisomes

Answer: Glyoxysomes
74 The two sub-units of ribosomes remain united ate a critical ion level
(A) Calcium
(B) Copper
(C) Manganese
(D) Magnesium

Answer: Magnesium
75 Which one of the following structures is an organelle with an organelle
(A) Ribosome
(B) Peroxisome
(C) ER
(D) Mesosome

Answer: Ribosome
76 Which one of the following of the cellular parts is correctly described
(A) Thylakoids – Flattened membranous sacs forming the Grana of Chloroplasts
(B) Centrioles – Sites of active RNA synthesis
(C) Ribosomes – those on chloroplasts are larger (80S) while those in cytoplasm are smaller (70S)
(D) Lysosomes – optimally active at a pH of about 8.5

Answer:Thylakoids – Flattened membranous sacs forming the Grana of Chloroplasts
77 Lamp brush chromosomes are see sin in which typical stage?
(A) Mitotic metaphase
(B) Meiotic prophase
(C) Mitotic anaphase
(D) Mitotic prophase

Answer: Meiotic prophase
78 The term cell was given by
(A) Robert Hooke
(B) Tatum
(C) Schwann
(D) De Bary

Answer: Robert Hooke
79 The cell is not applied for
(A) Algae
(B) Bacteria
(C) Virus
(D) Fungi

Answer: Virus
80 The membrane around the vacuole is known as
(A) Tonoplast
(B) Elaioplast
(C) Cytoplast
(D) Amyloplast

Answer: Tonoplast
81 Microfilaments are composed of a protein called
(A) Tubulin
(B) Actin
(C) Myosin
(D) Chitin

Answer:Actin
82 A plant cell wall is mainly composed of
(A) Protein
(B) Cellulose
(C) Lipid
(D) Starch

Answer: Cellulose
83 Glycolipids in the plasma membrane are located at
(A) Inner leaflet of the plasma membrane
(B) The outer leaflet of the plasma membrane
(C) Evenly distributed in the inner and outer leaflets
(D) It varies according to cell types

Answer: Inner leaflet of the plasma membrane
84 Lysosomes are known as “suicidal bags” because
(A) Parasitic activity
(B) Presence of food vacuole
(C) Hydrolytic activity
(D) Catalytic activity

Answer:Hydrolytic activity
85 The properties of integral membrane proteins can be studied by
(A) Atomic force microscopy
(B) Cryo-sectioning and electron microscopy
(C) Freeze-fracture technique and electron microscopy
(D) All of the above

Answer: Freeze-fracture technique and electron microscopy
86 The fluidity of the plasma membrane increases with
(A) Increase in unsaturated fatty acids in the membrane
(B) Increase in saturated fatty acids in the membrane
(C) Increase in glycolipid content in the membrane
(D) Increase in phospholipid content in the membrane

Answer: Increase in unsaturated fatty acids in the membrane
87 Which among the following defines GPI anchored proteins?
(A) Integral proteins of the plasma membrane
(B) Peripheral proteins of the plasma membrane
(C) Proteins that bind to ion-gated channels in the plasma membrane
(D) Proteins which randomly bind to lipids of the plasma membrane

Answer: Peripheral proteins of the plasma membrane
88 The resting potential membrane is determined by
(A) Potassium-ion gradient
(B) Sodium-ion gradient
(C) Bicarbonate-ion gradient
(D) None

Answer:Potassium-ion gradient
89 The oxygen and carbon dioxide crosses the plasma membrane by the process of
(A) Active diffusion
(B) Facilitated diffusion
(C) Passive diffusion
(D) Random diffusion

Answer:Passive diffusion
90 A cell without a cell wall is termed as
(A) Tonoplast
(B) Protoplast
(C) Symplast
(D) Apoplast

Answer: Protoplast

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