The period between two cell cycles

The stage between interphase and mitosis

The stage between mitosis and meiosis

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NEET • BIOLOGY • CELL-CYCLE & CELL DIVISION

Cell-cycle & cell division practice · Hard

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1 Hard

1 of 43

Understanding +4 | -1

At metaphase of mitosis, each chromosome consists of ________ chromatid(s) _________ centromere(s) _________ kinetochore(s) and _________ molecule(s) of DNA.

View answer and explanation

Correct option: C

2, 1, 2, 2

Option C (2, 1, 2, 2) is correct because at metaphase, each chromosome consists of two chromatids, one centromere, two kinetochores, and two DNA molecules.

2 Hard

2 of 43

Remembering +4 | -1

Mitosis occurs in:

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Correct option: D

All of these

Option D (All of these) is correct because mitosis occurs in all somatic cells for growth, repair, and maintenance.

3 Hard

3 of 43

Remembering +4 | -1

Interkinesis means

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Correct option: C

The stage between two meiotic stages

Option C (The stage between two meiotic stages) is correct because interkinesis is the brief interphase-like period between meiosis I and meiosis II.

4 Hard

4 of 43

Application +4 | -1

If a daughter cell of a plant, after mitosis contains 6 chromosomes and

20 {pg}

DNA

, then the number of chromosomes and amount of

DNA

respectively in

{G}_2

-phase of the cell is

View answer and explanation

Correct option: B

6 and

40 \,{pg}

Option B (6 and 40 pg) is correct because in the G2 phase, the DNA content doubles after replication, while the chromosome number remains the same as after mitosis.

5 Hard

5 of 43

Understanding +4 | -1

Assertion (A): Distribution of replicated chromosomes (DNA) to daughter nuclei by a complex series of events is almost accurate phenomenon.

Reason (R): Such distribution of replicated chromosomes to daughter nuclei by a complex series of events is under genetic control.

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Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because the accurate distribution of chromosomes is genetically controlled.

6 Hard

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Remembering +4 | -1

During meiosis 1, the chromosomes start pairing at

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Correct option: B

Zygotene

Option B (Zygotene) is correct because chromosome pairing (synapsis) begins during the zygotene stage of prophase I in meiosis I.

7 Hard

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Understanding +4 | -1

Assertion (A): Small cells are metabolically less active.

Reason (R): K.I. of small cells is less.

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Correct option: D

Both (A) and (R) are false

Option D (Both (A) and (R) are false) is correct because small cells are metabolically MORE active and have a HIGHER K.I. (Karyoplasmic Index).

8 Hard

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Remembering +4 | -1

Transition to metaphase in followed by?

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Correct option: A

Diakinesis

Option A (Diakinesis) is correct because diakinesis is the stage that immediately follows diplotene in prophase I of meiosis.

9 Hard

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Understanding +4 | -1

Which of the following statements are correct for meiosis?
I. Meiosis is a double division. It gives rise to four cells
II. The cells undergoing meiosis may be haploid or diploid
III. No bouquet stage is recorded
IV. Pairing or synapsis of homologous chromosomes takes place during zygotene of prophase-I and continues upto metaphase-I
Option containing correct statement is

View answer and explanation

Correct option: B

I and IV

Option B (I and IV) is correct because Meiosis is a double division resulting in four cells, and pairing/synapsis of homologous chromosomes occurs during zygotene of prophase-I and continues up to metaphase-I.

10 Hard

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Assertion (A): Growth and reproduction are characteristics of cells, indeed of all living organism.

Reason (R): Cycle of growth and division allow a single cell to form a structure consisting of millions of cells.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because growth and reproduction are indeed characteristics of cells, and the cycle of growth and division explains how a single cell forms a multicellular structure.

11 Hard

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Dyad cells were observed in?

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Correct option: B

Telophase-I

Option B (Telophase-I) is correct because dyad cells, which are cells containing two chromatids joined at the centromere, are observed after meiosis I, specifically in telophase I.

12 Hard

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Remembering +4 | -1

Diakinesis is marked by

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Correct option: D

All of the above

Option D (All of the above) is correct because diakinesis, the final stage of prophase I in meiosis, is marked by terminalization of chiasmata, degeneration of the nucleolus, and chiasmata shifting towards chromosome ends.

13 Hard

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Remembering +4 | -1

The post mitotic phase of the cell in which active synthesis of RNA and proteins takes place is:

View answer and explanation

Correct option: D

G_1

-phase

Option D (

G_1

-phase) is correct because the

G_1

phase is characterized by active synthesis of RNA and proteins for cell growth.

14 Hard

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Remembering +4 | -1

Micro tubules are absent in?

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Correct option: A

Mitochondria

Option A (Mitochondria) is correct because mitochondria have their own DNA and ribosomes and do not contain microtubules.

15 Hard

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Understanding +4 | -1

Assertion (A): Smaller cells are usually metabolically active cells.
Reason (R): Smaller cells have higher nucleocytoplasmic ratio and higher surface volume ratio.

View answer and explanation

Correct option: A

If both A and R are true and R is the correct explanation of A

Option A (If both A and R are true and R is the correct explanation of A) is correct because smaller cells are more metabolically active due to their higher surface area to volume ratio and nucleocytoplasmic ratio.

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16 Hard

16 of 43

Remembering +4 | -1

Mitosis can be inhibited by

View answer and explanation

Correct option: B

colchicine

Option B (colchicine) is correct because colchicine inhibits mitosis by disrupting microtubule formation.

17 Hard

17 of 43

Understanding +4 | -1

Which of the following is unique to mitosis and not a part of meiosis?

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Correct option: A

Homologous chromosomes behave independently

Option A (Homologous chromosomes behave independently) is correct because in mitosis, homologous chromosomes do not pair or interact, whereas in meiosis, they pair and may crossover.

18 Hard

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Remembering +4 | -1

Colchicine arrests which of the following stage of cell division?

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Correct option: D

Metaphase

Option D (Metaphase) is correct because Colchicine inhibits microtubule polymerization, disrupting the spindle apparatus and arresting cells at metaphase.

19 Hard

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Understanding +4 | -1

If 6000 nucleotides are in G-phase, how many nucleotides are present in S-phase.

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Correct option: B

12000

Option B (12000) is correct because the amount of DNA doubles during the S phase, so if there are 6000 nucleotides in G1, there will be 12000 in S phase.

20 Hard

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Understanding +4 | -1

What will be the DNA content and number of chromosomes in
a cell of after S phase as compared to
the gamete of the same organism?

View answer and explanation

Correct option: B

Four times DNA content but double chromosome number

Option B (Four times DNA content but double chromosome number) is correct because after S phase, DNA content is doubled and since the cell is diploid, the chromosome number is double that of a gamete.

21 Hard

21 of 43

Remembering +4 | -1

Chromosomal material becoming untangled during chromatin condensation in?

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Correct option: A

Prophase

Option A (Prophase) is correct because during prophase, the chromatin condenses, and the tangled chromosomal material starts to untangle.

22 Hard

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Application +4 | -1

Bacterial cell divides avery 20 minutes. How many bacteria will form after 2 hours

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Correct option: A

Option A (64) is correct because in 2 hours (120 minutes), the bacteria will divide 120/20 = 6 times. Therefore, the number of bacteria formed will be 2⁶ = 64.

23 Hard

23 of 43

Understanding +4 | -1

Which of the following statements are correct for

{G_1}

-phase?I. It is the last substage of interphase
II. Cell organelles do not increase in number
III. Both cell and nucleus grow in size
IV. It synthesizes RNAs, proteins and other biochemical for cell growth and subsequent replication of DNA
Choose the correct option

View answer and explanation

Correct option: B

II and IV

Option B (II and IV) is correct because in G1 phase, cell organelles increase in number and RNAs, proteins and other biochemicals are synthesized.

24 Hard

24 of 43

Understanding +4 | -1

Microtubule depolymerizing drug such as colchicine is expected to

View answer and explanation

Correct option: A

Inhibit spindle formation during mitosis

Option A (Inhibit spindle formation during mitosis) is correct because colchicine disrupts microtubule polymerization, which is essential for spindle formation.

25 Hard

25 of 43

Understanding +4 | -1

Cleavage is a unique form of mitotic cell division in which

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Correct option: C

No spindle developers to guide the cells

Option A (There is no growth of cells) is correct because cleavage divisions are characterized by rapid cell division without significant cell growth, resulting in smaller cells with each division.

26 Hard

26 of 43

Understanding +4 | -1

A somatic cell that has just competed the S phase of its cell cycle, as compared to gamete of the same species, has:

View answer and explanation

Correct option: B

Twice the number of chromosomes and four times the amount of DNA

Option B (Twice the number of chromosomes and four times the amount of DNA) is correct because after S phase, a somatic cell has twice the number of chromosomes and four times the DNA content compared to a gamete.

27 Hard

27 of 43

Remembering +4 | -1

At which stage of cell cycle colchicine arrests the spindle?

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Correct option: A

Anaphase

Option A (Anaphase) is correct because colchicine disrupts spindle fiber formation, arresting cells in metaphase or anaphase.

28 Hard

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Understanding +4 | -1

In …A…. phase, there is synthesis of RNAs and proteins that are needed for cell growth and replication of DNA. While it is …B… phase, where synthesis of protein occur that is needed for spindle formation and mitosis to continue. Identify A and B to complete the given statement

View answer and explanation

Correct option: C

A-

{G_1}

; B-

{G_2}

Option C (A-G1; B-G2) is correct because G1 phase involves synthesis of RNAs and proteins for cell growth and DNA replication, while G2 phase involves synthesis of proteins for spindle formation and mitosis.

29 Hard

29 of 43

Remembering +4 | -1

Choose the correct answer for the statements given below
I. Protein involved in the shortening and thickening of chromosome fibres
II. The name of early prophase when elongated chromosomes occur in overlapped condition like a ball of wool without their ends being visible
III. Each group of astral rays along with its centriole pair
IV. Name the narrow point which is responsible for attaching two sister chromatids to each other

View answer and explanation

Correct option: C

I-Codensins, II-Spirme stage, III-Aster, IV-Centromere

Option C (I-Codensins, II-Spirme stage, III-Aster, IV-Centromere) is correct as it correctly matches each description to its term.

30 Hard

30 of 43

Understanding +4 | -1

Arrange the following events of meiosis in the correct sequence.
I. Terminalization
II. Crossing over
III. Synapsis
IV. Disjunction of genomes
The correct sequence is

View answer and explanation

Correct option: B

3, 2, 1, 4

Option B (3, 2, 1, 4) is correct because it represents the correct sequence of events in prophase I of meiosis: Synapsis, Crossing over, Terminalization, and Disjunction of genomes.

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