Question

503. Cell cycle progression is triggered at ______ regulatory transitions?

1) 1
2) 2
3) 3
4) 4

Answer 1

The cell cycle is triggered at 3 regulatory transitions.

Step-by-step explanation:

The correct answer is 3) 3

The cell cycle is regulated by internal controls called checkpoints. There are three major checkpoints in the cell cycle: one near the end of G₁, a second at the G₂/M transition, and the third during metaphase.

These checkpoints monitor the progress of the cell cycle, ensuring that all the necessary conditions are met before the cell can proceed to the next stage of cell division. Positive regulator molecules allow the cell cycle to advance, while negative regulator molecules can halt the cycle until specific requirements are met.