AIIMS2019BotanyCell Cycle and Cell Division
What happens to a cell during M phase of cell cycle?
Options
- ANucleocytoplasmic index decreases.
- BNucleocytoplasmic index increases.
- CNucleocytoplasmic index fluctuates.
- DNucleocytoplasmic index remains constant.
Correct answer
A. Nucleocytoplasmic index decreases.
Step-by-step solution
During G₁ phase, the cell is in resting state and the nucleocytoplasmic index is stable. During the S phase of the cell cycle, DNA replicates, consequently nucleocytoplasmic index increases due to increase in nuclear volume. During G₂ phase, the cell is again stable. During M phase, nucleocytoplasmic index decreases. After M phase or mitosis when the cell divides, nucleoplasmic index returns to normal.