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Cell Cycle and Cell Division · Question 73

AIPMT 2002MCQEasy📈 Topic in 50% papers+4−1
1

Mitotic spindle is mainly composed of which protein?

  1. Actin
  2. Myosin
  3. Tubulin
  4. Myoglobin

Answer

(3) Tubulin

Solution

As per NCERT, the spindle fibres of the mitotic apparatus are formed from microtubules organised by the centrosome (centrioles).

⇒ Microtubules are hollow cylinders built of the protein tubulin.

∵ Actin forms microfilaments, myosin is a muscle (motor) protein and myoglobin is an oxygen-storing protein of muscles.

∴ The mitotic spindle is mainly composed of tubulin.

Answer: (3)

AIPMT 2002

Keep practising — Cell Cycle and Cell Division

2

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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