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Critical thinking........
4.) "progressing from G1 to S"
This phrase means that the cell is going from the first growing stage to the DNA synthesis phase. In the first growing stage, centrioles begin replicating, then in the S phase the DNA is replicated.
5.) "passage from G2 to M"
This phrase means that in order for the cell-cycle to continue after G2, there has to be enough MPF(a M phase promoting factor) so it can give the signal for the cell to enter into the M phase. This is also called a checkpoint.