NEET Biology Cell Cycle and Cell Division MCQs Set 08

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Chapter-wise Objective Questions: Cell Cycle and Cell Division

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Multiple Choice Questions

Question 1: The sequence of events by which cells duplicate their genome, synthesize the other components of cell which eventually distribute into two daughter cells is called
(a) Quiescent stage
(b) Generation time
(c) Cell cycle
(d) Kinetochore
Show Answer & Explanation

Answer: (c) Cell cycle

Explanation:
1. While : Quiescent stage → In this phase cell remains metabolically active but do not proliferate unless they are called on to do so.
2. Generation time → Time between two consecutive cell cycles i.e., Time taken by the number of cells to be doubled.
3. Kinetochore → Trilamellar proteinaceous structure present at centromere.It is attachment site for spindle fibers.

Question 2: DNA replication occurs in
(a) S phase
(b) G1 phase
(c) G2 phase
(d) M phase
Show Answer & Explanation

Answer: (a) S phase

Explanation:
1. While G1 phase – Organelles duplicate in this phase G2 phase – Tubulin protein synthesis M phase – Mitotic phase.

Question 3: The phase between the two successive M phase is called as
(a) Metaphase
(b) Anaphase
(c) Prophase
(d) Interphase
Show Answer & Explanation

Answer: (d) Interphase

Explanation:
1. At interphase cell undergo growth.

Question 4: A biosynthetic phase where cell organelle duplicate itself is
(a) Interphase
(b) Anaphase
(c) Prophase
(d) Telophase
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Answer: (a) Interphase

Explanation:
1. While Prophase : Condensation of chromatin begin.
2. Anaphase : Centromere splits and chromatid separation Metaphase : Condensed chromosome align themselves at equator.

Question 5: Yeast can progress through the cell cycle in about
(a) 90 sec
(b) 90 min
(c) 90 hrs
(d) 90 yrs
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Answer: (b) 90 min

Explanation:
1. Yeast cell completes its cell cycle in 90 min.

Question 6: _________ represents the most active stage of the cell cycle.
(a) Metaphase
(b) Anaphase
(c) Telophase
(d) Interphase
Show Answer & Explanation

Answer: (d) Interphase

Explanation:
1. This is so because in this phase cell prepares itself for cell division.

Question 7: _________ phase synthesizes enzymes required during S phase.
(a) G2
(b) M
(c) S
(d) G1
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Answer: (d) G1

Explanation:
1. While M → Mitotic phase G2 → Organelle duplication like Mitochondria S → DNA duplication.

Question 8: Non-dividing cells enter the
(a) G2 phase
(b) M phase
(c) G0 phase
(d) S phase
Show Answer & Explanation

Answer: (c) G0 phase

Explanation:
1. G0 phase also known Quiescent phase.

Question 9: If the initial amount of DNA is 8 C, then after S phase the amount of DNA would be
(a) 4 C
(b) 8 C
(c) 64 C
(d) 16 C
Show Answer & Explanation

Answer: (d) 16 C

Explanation:
1. This is so because DNA duplicates during S phase.

Question 10: The number of chromosomes in G1 phase is 36, the number of chromosomes in S phase is
(a) 36
(b) 18
(c) 22
(d) 37
Show Answer & Explanation

Answer: (a) 36

Explanation:
1. This is so because after S phase only DNA content duplicates not the number therefore, each chromosome will be having two chromatids.

Question 11: A phase of the cell cycle which lasts more than 95% of the total duration is
(a) Prophase
(b) Interphase
(c) Anaphase
(d) Telophase
Show Answer & Explanation

Answer: (b) Interphase

Explanation:
1. This is so because cell prepares itself for division during this phase.

Question 12: Most dramatic period of cell cycle is
(a) G1 phase
(b) G2 phase
(c) S phase
(d) M phase
Show Answer & Explanation

Answer: (d) M phase

Explanation:
1. This is so because during mitotic phase movement of chromosomes is visible.

Question 13: A cell division in which a diploid somatic cell divides into two identical daughter cells is called
(a) Meiosis I
(b) Meiosis II
(c) Mitosis
(d) Cytokinesis
Show Answer & Explanation

Answer: (c) Mitosis

Explanation:
1. Mitosis (equational division) occurs in somatic cells.

Question 14: Which type of cell division is called somatic cell division?
(a) Meiosis I
(b) Meiosis II
(c) Reduction division
(d) Mitosis
Show Answer & Explanation

Answer: (d) Mitosis

Explanation:
1. Mitosis cell division is also called somatic cell division.

Question 15: Mitosis occurs in
(a) Meristematic cells
(b) Undifferentiated germ cells
(c) Somatic cells
(d) More than one option is correct
Show Answer & Explanation

Answer: (d) More than one option is correct

Explanation:
1. Mitosis occurs in both somatic cells and undifferentiated germ cells of both plants and animals.

Question 16: The first phase of mitosis which follows interphase is
(a) Metaphase
(b) Prophase
(c) Telophase
(d) Anaphase
Show Answer & Explanation

Answer: (b) Prophase

Explanation:
1. Prophase is the first phase of mitosis.

Question 17: Initiation of condensation of chromatin material occurs in
(a) Prophase
(b) Anaphase
(c) Telophase
(d) Metaphase
Show Answer & Explanation

Answer: (a) Prophase

Explanation:
1. Chromatin condenses to form chromosome in prophase.

Question 18: The chromosomes are shortest and thickest during
(a) Anaphase
(b) Metaphase
(c) Telophase
(d) Interphase
Show Answer & Explanation

Answer: (b) Metaphase

Explanation:
1. This is so because condensation is completed.

Question 19: The chromosomes align at the equator during
(a) Interphase
(b) Prophase
(c) Metaphase
(d) Telophase
Show Answer & Explanation

Answer: (c) Metaphase

Explanation:
1. In Metaphase all chromosome arrange at equator of cell to form equitorial or meltaphasic plate.

Question 20: Read the following statements<br />(a) Complete disintegration of the nuclear envelope marks the start of the second phase of mitosis.<br />(b) Metaphase chromosome is made up of one sister chromatid.
(a) Only (b) is correct
(b) Both (a) & (b) are incorrect
(c) Only (a) is correct
(d) Both (a) & (b) are correct
Show Answer & Explanation

Answer: (c) Only (a) is correct

Explanation:
1. Complete disintegration of nuclear envelope marks the start of the second phase of mitosis. i.e., Metaphase.
2. Metaphasic chromosome has two sister chromatids.

Question 21: The morphology of the chromosomes is studied during
(a) Metaphase
(b) Interphase
(c) Prophase
(d) Telophase
Show Answer & Explanation

Answer: (a) Metaphase

Explanation:
1. This is so because chromosomes are completed condensed, shortest and thickest in this stage.

Question 22: Chromosomes move towards the pole during
(a) Prophase
(b) Metaphase
(c) Telophase
(d) Anaphase
Show Answer & Explanation

Answer: (d) Anaphase

Explanation:
1. Poleward movement is also called anaphasic movement.

Question 23: The centromere splits during
(a) Anaphase
(b) Telophase
(c) Interphase
(d) Prophase
Show Answer & Explanation

Answer: (a) Anaphase

Explanation:
1. At anaphase centromere splits and the chromatids move towards opposite poles.

Question 24: The mitotic spindle disappears in
(a) Prophase
(b) Metaphase
(c) Anaphase
(d) Telophase
Show Answer & Explanation

Answer: (d) Telophase

Explanation:
1. This is so because proper division and distribution of DNA has been done, so now there is no further use of spindle appratus.

Question 25: _________ phase marks the end of M-phase.
(a) Karyokinesis
(b) Prophase
(c) Cytokinesis
(d) Telophase
Show Answer & Explanation

Answer: (c) Cytokinesis

Explanation:
1. M-phase begins with karyokinesis and ends with cytokinesis.

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