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Cell Cycle and Cell Division · Question 67

AIPMT 2009MCQMedium📈 Topic in 62% papers+4−1
1

Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/phase in the cell cycle? [figure]

  1. C - karyokinesis
  2. D - synthetic phase
  3. A - cytokinesis
  4. B - metaphase

Answer

(2) D - synthetic phase

Solution

In the figure, the inner circle is interphase and the fan on top is the M phase (mitosis); the arrows show that the cycle runs clockwise.

⇒ As per NCERT, interphase is divided into G1 phase, S phase (synthesis phase) and G2 phase, in this order.

⇒ Leaving mitosis clockwise, the right part of the ring is G1 (with G0 branching off), the lower-left part D is the S phase, and the upper-left part is G2, which leads back into mitosis.

⇒ In the M phase fan, band A spans the four stages of nuclear division (karyokinesis), B is the third of these stages (anaphase), and the separate last column C is cytokinesis.

∴ The correct indication is D – synthetic phase.

Answer: (2)

AIPMT 2009

Keep practising — Cell Cycle and Cell Division

2

At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

  1. During G2 stage of prophase
  2. During S-phase
  3. During entire prophase
  4. During telophase
AIPMT 2005
3

Centromere is required for -

  1. Crossing over
  2. Movement of chromosomes towards poles
  3. Transcription
  4. Cytoplasmic cleavage
AIPMT 2005
4

In the somatic cell cycle

  1. in G1 phase DNA content is double the amount of DNA present in the original cell
  2. DNA replication takes place in S phase
  3. a short interphase is followed by a long mitotic phase
  4. G2 phase follows mitotic phase
AIPMT 2004
5

If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?

  1. Metaphase
  2. Telophase
  3. Anaphase
  4. Prophase
AIPMT 2004
6

Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle?

  1. Decondensation from chromosomes, and reassembly of the nuclear lamina
  2. Transcription from chromosomes, and reassembly of the nuclear lamina
  3. Formation of the contractile ring, and formation of the phragmoplast
  4. Formation of the contractile ring, and transcription from chromosomes
AIPMT 2004
7

Mitotic spindle is mainly composed of which protein?

  1. Actin
  2. Myosin
  3. Tubulin
  4. Myoglobin
AIPMT 2002
8

In which stage of cell cycle, DNA replication occurs?

  1. G1-phase
  2. S-phase
  3. G2-phase
  4. M-phase
AIPMT 2000

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