NEET Biology Cell The Unit of Life MCQs Set 07

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Multiple Choice Questions

Question 1: Lysosomes are rich in
(a) Nucleic acids
(b) Hydrolytic enzymes
(c) Carbohydrates
(d) Hormones
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Answer: (b) Hydrolytic enzymes

Explanation:
1. Hydrolytic enzymes have digestive action.

Question 2: Heterophagosomes are
(a) Primary lysosomes
(b) Secondary lysosomes
(c) Autophagic vacuole
(d) Tertiary lysosomes
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Answer: (b) Secondary lysosomes

Explanation:
1. Secondary lysosomes formed by the fusion of food vacuoles and primary lysosomes.

Question 3: The inner membrane of the mitochondria is usually, highly convoluted, forming a series of infoldings known as
(a) Thylakoids
(b) Lamellae
(c) Cristae
(d) Grana
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Answer: (c) Cristae

Explanation:
1. Cristae Thylakoids, Lamellae and Grana are parts of chloroplasts.

Question 4: In mitochondria, cristae act as sites for
(a) Protein synthesis
(b) Phosphorylation of flavoproteins
(c) Breakdown of macromolecules
(d) Oxidation-reduction reaction
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Answer: (d) Oxidation-reduction reaction

Explanation:
1. Cristae-site of ETS and oxidative phosphorylation.

Question 5: Which of the following type of plastids does not contain stored food material?
(a) Amyloplasts
(b) Chromoplasts
(c) Elaioplasts
(d) Aleuroplasts
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Answer: (b) Chromoplasts

Explanation:
1. Chromoplasts contain coloured pigment.
2. Amyloplasts → Store starch Elaioplasts → Fats Aleuroplasts → Proteins.

Question 6: In chloroplasts, chlorophyll is present in the
(a) Outer membrane
(b) Inner membrane
(c) Thylakoids
(d) Stroma
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Answer: (c) Thylakoids

Explanation:
1. Thylakoids are the membranous sac which contain pigments.

Question 7: The proteins are synthesized at
(a) Centrosomes
(b) Golgi bodies
(c) Ribosomes
(d) Mitochondria
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Answer: (c) Ribosomes

Explanation:
1. Ribosomes are also known protein synthesising machinery of cell.

Question 8: Microtubule is involved in the
(a) Muscle contraction
(b) Membrane architecture
(c) Cell division
(d) DNA recognition
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Answer: (c) Cell division

Explanation:
1. Microtubule is involved in cell division by helping in the formation of spindle apparatus.

Question 9: Microtubules are absent in
(a) Mitochondria
(b) Flagella
(c) Spindle fibres
(d) Centrioles
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Answer: (a) Mitochondria

Explanation:
1. Microtubules are cytoskeletons.

Question 10: Centromere is required for
(a) Replication of DNA
(b) Chromosome segregation
(c) Poleward movement of chromosome
(d) Cytoplasmic cleavage
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Answer: (c) Poleward movement of chromosome

Explanation:
1. Centromere is required for poleward movement of chromosome because it contains a proteinaceous trilamellar structure that provides binding site of spindle fibres.
2. Centromer Spindle fibres Centromere splites and chromatid moves towards opposite poles.

Question 11: Lampbrush chromosomes are seen in which typical stage?
(a) Mitotic metaphase
(b) Meiotic prophase
(c) Mitotic anaphase
(d) Mitotic prophase
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Answer: (b) Meiotic prophase

Explanation:
1. This is so because they are formed when cell exhibits extended diplotene stage which is a stage of prophase I of meiosis.

Question 12: Centromere is a part of
(a) Chromosome
(b) Endoplasmic reticulum
(c) Ribosomes
(d) Mitochondria
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Answer: (a) Chromosome

Explanation:
1. Centromere Centromere is a part of chromosome and is also known a primary constriction.

Question 13: Which of the following occurs more than one and less than five in a chromosome?
(a) Chromatid
(b) Chromosome
(c) Centromere
(d) Telomere
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Answer: (d) Telomere

Explanation:
1. 1 Telomere 1 2 Telomere Centromere 2 Telomere 3 4 Telomere (More than one).

Question 14: Ribosomes are produced in
(a) Nucleolus
(b) Cytoplasm
(c) Mitochondria
(d) Golgi body
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Answer: (a) Nucleolus

Explanation:
1. Nucleolus is rich in rDNA therefore it is the site of synthesis of ribosomes.

Question 15: Some of the enzymes, which are associated in converting fats into carbohydrates, are present in
(a) Microsomes
(b) Glyoxysomes
(c) Liposomes
(d) Golgi bodies
Show Answer & Explanation

Answer: (b) Glyoxysomes

Explanation:
1. Glyoxylate cycle converts fats into carbohydrates.

Question 16: Assertion (A): RBC membrane is highly flexible.
Reason (R): Amount of external protein in cytoplasmic face of membrane is more.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
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Answer: (a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Explanation:
1. Extrinsic proteins are more towards cytoplasmic face of plasma membrane.

Question 17: Assertion (A): Lampbrush chromosomes show transcriptionally active loops.
Reason (R): Informosomes can be used in future for embryo development.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
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Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

Explanation:
1. Packets of mRNA and proteins present in cytoplasm of oocytes are called informosomes.

Question 18: Assertion (A): Centriole does not form any compartment in a cell.
Reason (R): Centriole is a non-membranous cell organelle.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
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Answer: (a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Explanation:
1. Membrane bound organelles are responsible for compartmentlisation of cell.

Question 19: Assertion (A): Janus green B is a vital stain for locating mitochondria.
Reason (R): Janus green is oxidised by cytochrome oxidase present in mitochondria.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Explanation:
1. The stain which import colour to living things is known as vital stain.

Question 20: Assertion (A): Lysosomes help in digestion of foreign particles in the animal cells.
Reason (R): They have respiratory enzymes.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Lysosomes have hydrolytic enzymes.

Question 21: Assertion (A): Chromoplast is coloured plastid in corolla and ripened fruits.
Reason (R): It has water soluble chlorophyll and carotenoid pigments.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Chlorophyll and carotenoids pigments are not water soluble.

Question 22: Assertion (A): The axoneme of eukaryotic flagellum possesses a number of microtubules running parallel to the long axis.
Reason (R): It has a pair of peripheral doublet and a pair of centrally located microtubules.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. It has nine pairs of peripheral doublet.

Question 23: Assertion (A): Lipids are arranged within the cell membrane with the hydrophobic tails towards the inner part.
Reason (R): This ensures that non-polar tail of saturated hydrocarbons is protected from the aqueous environment.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Explanation:
1. This ensures that they do not come in contact with water (aqueous environment).

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