why do the molecular events controlling the cell cycle happen in a particular sequence?
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Card 8
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M phase - a checkpoint chemical triggers condensation of chromatin.
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Card 9
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metaphase checkpoint.
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Card 10
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G0 (gap 0) phase - a resting phase triggered during early G1 at the resting point, by a checkpoint chemical.
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Card 11
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G1 (gap 1) phase - (growth phase) A G1 checkpoint control mechanism ensures that the cell is ready to enter the S phase and begin DNA synthesis.
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Card 12
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S (synthesis) phase - because the chromosomes are unwound and the DNA is diffuse, every molecule of DNA is replicated in a specific sequence.
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Card 13
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G2 (gap 2) phase - special chemicals ensure the cell is ready for mitosis by stimulating proteins that will be involved in making chromosomes condense and in formation of the spindle.
