After Which Checkpoint is the Cell First Committed to Continue

Question

After which checkpoint is the cell first committed to continue the cell cycle through M?
A) G₀
B) G₁
C) G₂
D) S
E) previous M

Accepted Answer

The checkpoint for cell commitment to continue into the M phase occurs after the G₁ phase. In G₁, the cell undergoes growth and prepares for DNA replication. Once the cell passes the G₁ checkpoint, it is committed to continuing through the cell cycle and undergoing mitosis.