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Cells Alive – Cell Cycle
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Gap 1 Phase (G1) – Cell Growth, produce RNA, synthesize protein
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Gap 0 Phase (G0) – cell stops dividing (temporary or permanent)
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G1 Checkpoint – “Is cell big enough and the environment stable?”
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Continue G1 Phase – If cell passes G1 checkpoint, the cell continues cycle
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Synthesis Phase (S phase) – Period of DNA replication, going from 2N to 4N in preparation for mitosis
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Gap 2 Phase (G2 phase) – After DNA replication, the cell continues to grow and produce proteins
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Gap 2 (G2) Checkpoint – “Has DNA replicated, cell big enough and environment stable?”
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Begins mitosis – cell growth and protein production stops; cell begins division process
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Metaphase Checkpoint – “Is cell ready to complete division?”
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Continue Mitosis – Cell finishes dividing and two new daughter cells enter interphase; old cell no longer exists
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