Given what we know about the cell cycle, we can confirm that the stage in question refers to the G2 stage.
The cell cycle can be divided into four stages, which are :
- G1 or growth phase
- Duplication of DNA
- G2 or preparation phase
- Mitosis.
The first stage in the cycle is that of G1 or growth. As the name indicates, the cell undergoes rapid growth during this stage. Next is the duplication stage where the DNA is replicated in advance so that the cell can undergo mitosis.
The third phase is the one that this question refers to, in which the cell grows substantially and undergoes checkpoints in which biological factors check the replicated DNA for errors. Finally, the cell ends the cycle by multiplying via mitosis.
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