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Cell Cycle and Cell Division · Question 70

AIPMT 2004MCQEasy📈 Topic in 62% papers+4−1
1

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

Answer

(2) DNA replication takes place in S phase

Solution

As per NCERT, S (synthesis) phase is the period during which DNA synthesis or replication takes place; the amount of DNA per cell doubles (2C → 4C).

In G1 the DNA content is not doubled; interphase is long (> 95% of the cycle) and M phase is short; G1 (not G2) follows M phase.

Answer: (2)

AIPMT 2004

Keep practising — Cell Cycle and Cell Division

2

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
3

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
4

Mitotic spindle is mainly composed of which protein?

  1. Actin
  2. Myosin
  3. Tubulin
  4. Myoglobin
AIPMT 2002
5

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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