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 nuclear membrane disintegrates. b dna replicates. c centrioles form. d the nucleolus divides.

Explanation:

The cell - cycle stages are G1, S, G2, and M. The S stage is for DNA replication. After DNA replication in the S stage, the cell enters the G2 stage. The nuclear membrane disintegrates in the M stage (mitosis). Centrioles form at different times depending on the cell type and are not the key event before G2. The nucleolus divides during mitosis. So, DNA replication occurs just before G2.

Answer:

B. DNA replicates.