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Cell Cycle and Cell Division · Question 51

AIPMT 2014MCQMedium📈 Topic in 62% papers+4−1
1

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

Answer

(3) Only G2

Solution

As per NCERT, during the S phase the amount of DNA per cell doubles: if the initial amount is 2C, it increases to 4C.

⇒ G0 and G1 phases have 2C DNA; in S phase DNA is rising from 2C to 4C.

⇒ In G2 phase (after S, before division) the DNA content stays at 4C throughout.

⇒ In M phase the replicated DNA is separated (anaphase) and distributed to the two daughter nuclei, so the 4C level is not maintained through the whole phase.

∴ The DNA remains at the 4C level only in G2.

Answer: (3)

AIPMT 2014

Keep practising — Cell Cycle and Cell Division

2

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
3

The enzyme recombinase is required at which stage of meiosis?

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

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

  1. bivalent
  2. axoneme
  3. equatorial plate
  4. kinetochore.
NEET 2013
5

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
6

During meiosis I, the chromosomes start pairing at

  1. zygotene
  2. pachytene
  3. diplotene
  4. leptotene.
NEET 2013 (Karnataka)
7

During the metaphase stage of mitosis, spindle fibres attach to chromosomes at

  1. kinetochore
  2. both centromere and kinetochore
  3. centromere, kinetochore and areas adjoining centromere
  4. centromere.
NEET 2013 (Karnataka)
8

A stage of mitosis is shown in the diagram. Which stage is it and what are its characteristics? [Figure]

  1. Anaphase - Centromeres split and chromatids separate and start moving away.
  2. Late prophase - Chromosomes move to spindle equator.
  3. Metaphase - Spindle fibers attached to kinetochores, centromeres split and chromatids separate.
  4. Metaphase - Chromosomes moved to spindle equator, chromosomes made up of two sister chromatids.
NEET 2013 (Karnataka)
9

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres.

  1. Metaphase I
  2. Metaphase II
  3. Anaphase I
  4. Anaphase II
AIPMT 2012 (Mains)
10

During gamete formation, the enzyme recombinase participates during

  1. metaphase I
  2. anaphase II
  3. prophase I
  4. prophase II.
AIPMT 2012 (Prelims)
11

Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage? [Figure]

  1. Prophase of Mitosis
  2. Both prophase and metaphase of mitosis
  3. Prophase I during meiosis
  4. Prophase-II during meiosis
AIPMT 2012 (Prelims)

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