Checkpoints in the cell cycle?

I

ivory_plr

New member
The first checkpoint in the cell cycle occurs
a) about the middle of the M phase
b) at the beginning of the G2 phase
c) just before entering the S phase
d) during the Go phase
e) at the end of the S phase

The second checkpoint in the cell cycle occurs
a) at the end of the S phase
b) at the beginning of the G2 phase
c) at the end of the M phase
d) at the end of the G2 phase
e) during the M phase

Explain why you chose your answers. Please help, thank you.
 
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