Question

what is the primary difference between g1 and g2?
g2 takes longer to complete than g1.
none of these answers are correct.
g1 is the first phase of the cell cycle and occurs before s, while g2 occurs after s.
g2 is the first phase of the cell cycle and occurs before s, while g1 occurs after s.

Explanation:

In the cell cycle, G1 (Gap 1) is the first phase after cell division and occurs before the S (synthesis) phase where DNA replication happens. G2 (Gap 2) occurs after the S phase. The statement about their positions relative to the S - phase is a key difference. The duration comparison (G2 takes longer than G1) is not a universal primary difference as it can vary. The option about G2 being first is incorrect.

Answer:

C. G1 is the first phase of the cell cycle and occurs before S, while G2 occurs after S.