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Question: Checkpoints occur between the stages of the cell cycle. If a cell does not meet certain criteria at the end of a stage, it will not move to the next stage. Which of these occurs just before the cell enters the G2 stage of the cell cycle? A.The nucleolus divides. B.Centrioles form. C.DNA replicates. D.The nuclear membrane disintegrates.
C. DNA replicates. During the cell cycle, DNA replication occurs in the S (synthesis) phase, which precedes the G2 phase. In the S phase, the cell synthesizes a complete copy of the DNA in its nucleus. Once this process is complete and the cell has checked that the replication has occurred without errors, it can then proceed to the G2 phase. In the G2 phase, the cell continues to grow and prepares for mitosis. Therefore, DNA replication must occur just before the cell enters the G2 stage.
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