Refer to the figure showing the eukaryotic cell cycle. At what point is the cell cycle likely to be the most difficult to reverse or to stop?
A) Early in G1 phase, before the restriction point (
B) Late in G1 phase, after the restriction point (
C) During S phase
D) Early in G2 phase
E) Late in G2 phase

Question

Refer to the figure showing the eukaryotic cell cycle.  At what point is the cell cycle likely to be the most difficult to reverse or to stop?
A) Early in G1 phase, before the restriction point (
B) Late in G1 phase, after the restriction point (
C) During S phase 
D) Early in G2 phase 
E) Late in G2 phase

Quizplus · Accepted Answer

Late in G1 phase, after the restriction point (R), is the point of no return. Once the cell passes this point, it is committed to completing the cell cycle and cannot be easily reversed or stopped.

Refer to the Figure Showing the Eukaryotic Cell Cycle