Question

At what checkpoint is the cell cycle halted if the environment is not favorable?

A) G1 Checkpoint
B) G2 Checkpoint
C) M Checkpoint
D) S Checkpoint

Answer 1

The cell cycle may be halted at the G1 Checkpoint if conditions are not favorable for cell division, taking into account factors like cell size, DNA integrity, and external growth factors.

Step-by-step explanation:

At what checkpoint the cell cycle is halted if the environment is not favorable? The answer is A) G1 Checkpoint. The G1 checkpoint determines whether all conditions are favorable for cell division to proceed. It is also called the restriction point. External factors like growth factors significantly impact whether the cell will pass this checkpoint.

The G1 checkpoint assesses if the cell has adequate reserves, appropriate cell size, and no genomic DNA damage. If these conditions are met, the cell will progress to the S phase. If not, the cell cycle may be halted, and the cell may enter the Go phase until conditions improve to allow for repair or retry for cell division.