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Cell Cycle and Cell Division

AIPMT 2004MCQEasy📈 Topic in 50% papers+4−1
Ques. 1AIPMT 2004

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

Answer

(1) Metaphase

Solution

As per NCERT, metaphase is the stage at which the morphology of chromosomes is most easily studied: chromosomes are maximally condensed and lie on the metaphase plate.

∴ The chromosomes are counted most conveniently at metaphase.

Answer: (1)

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Ques. 2AIPMT 2004

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
Ques. 3AIPMT 2002

Mitotic spindle is mainly composed of which protein?

  1. Actin
  2. Myosin
  3. Tubulin
  4. Myoglobin
Ques. 4AIPMT 2000

In which stage of cell cycle, DNA replication occurs?

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

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