What happens during the G1 checkpoint?

Question

A. The new cells enter into G1.

B. The cell ensures that its DNA has been copied correctly.

C. The cell pauses to conserve resources.

D. None of the above.

E. The cell decides if it will proceed to the S stage.

Answer 1

It's E.  The G1 checkpoint is located very near the end of the G1 phase, so the rest cannot be correct.  A would occur before the G1 phase, B would occur after S (there's a checkpoint for that too), and C doesn't really occur, because if there aren't enough resources the cycle stops and the cell enters G0.

Answer 2

E. The cell decides if it will proceed to the S stage.