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Cell Cycle and Cell Division · Question 46

NEET 2016 (Phase 2)MCQMedium📈 Topic in 62% papers+4−1
1

When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?

  1. G1/S
  2. G2/M
  3. M
  4. Both G2/M and M

Answer

(1) G1/S

Solution

Checkpoints of the cell cycle check the condition of the DNA before the cell is allowed to proceed.

⇒ The G1/S checkpoint checks DNA integrity and decides whether the cell will enter and continue the replication (S) phase.

∵ A stalled replication fork means that DNA replication cannot proceed normally (DNA damage or replication stress),

∴ the replication checkpoint at the G1/S transition is predominantly activated, halting the progress of the cell through S phase until the problem is repaired.

Answer: (1)

NEET 2016 (Phase 2)

Keep practising — Cell Cycle and Cell Division

2

Match the stages of meiosis in column I to their characteristic features in column II and select the correct option using the codes given below.

  1. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  2. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
  3. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
  4. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
NEET 2016 (Phase 2)
3

Arrange the following events of meiosis in correct sequence (i) Crossing over (ii) Synapsis (iii) Terminalisation of chiasmata (iv) Disappearance of nucleolus

  1. (i), (ii), (iii), (iv)
  2. (ii), (iii), (iv), (i)
  3. (ii), (i), (iv), (iii)
  4. (ii), (i), (iii), (iv)
AIPMT 2015
4

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

  1. twice the number of chromosomes and four times the amount of DNA
  2. four times the number of chromosomes and twice the amount of DNA
  3. twice the number of chromosomes and twice the amount of DNA
  4. same number of chromosomes but twice the amount of DNA.
AIPMT 2015 (Cancelled)
5

Select the correct option.

  1. (A) - (i); (B) - (ii); (C) - (v); (D) - (iv)
  2. (A) - (ii); (B) - (iii); (C) - (iv); (D) - (v)
  3. (A) - (ii); (B) - (i); (C) - (iii); (D) - (iv)
  4. (A) - (ii); (B) - (iii); (C) - (v); (D) - (iv)
AIPMT 2015 (Cancelled)
6

During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?

  1. G0 and G1
  2. G1 and S
  3. Only G2
  4. G2 and M
AIPMT 2014
7

In 'S' phase of the cell cycle

  1. amount of DNA doubles in each cell
  2. amount of DNA remains same in each cell
  3. chromosomes number is increased
  4. amount of DNA is reduced to half in each cell.
AIPMT 2014
8

The enzyme recombinase is required at which stage of meiosis?

  1. Pachytene
  2. Zygotene
  3. Diplotene
  4. Diakinesis
AIPMT 2014
9

The complex formed by a pair of synapsed homologous chromosomes is called

  1. bivalent
  2. axoneme
  3. equatorial plate
  4. kinetochore.
NEET 2013
10

A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics. [Figure]

  1. Telophase Endoplasmic reticulum and nucleolus not reformed yet.
  2. Telophase Nuclear envelope reforms, Golgi complex reforms.
  3. Late anaphase Chromosomes move away from equatorial plate, Golgi complex not present.
  4. Cytokinesis Cell plate formed, mitochondria distributed between two daughter cells.
NEET 2013
11

During meiosis I, the chromosomes start pairing at

  1. zygotene
  2. pachytene
  3. diplotene
  4. leptotene.
NEET 2013 (Karnataka)

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