Lecture 19 11

Lecture 19 11 - Lecture 19 11/28/07 Intro to Cell Cycle...

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Lecture 19 11/28/07 Intro to Cell Cycle Cell Cycle Important and central part of cell biology Cell theory – all cells arise from preexisting cells Therefore, cells need to replicate from each other 2 main roles of cell cycle: 1.) Duplicate genome 2.) Distribute duplicated genome to daughter cells - Interphase – 95% of cell life, days, weeks, months o G1 – cell growth, organelle duplication o S – DNA synthesis o G2 – additional growth, preparation for mitosis - Mitosis – 5% of time, cell division, 30 minutes – 1 hour - Non-dividing cells – stuck in G 0 phase (no growth phase) o Example: nerve cell that has already been differentiated will no longer divide -There are cells that divide when they are induced to divide o Example: Liver cells divide when there is damage to liver, liver recovers by telling cells to divide o Example: skin cells always dividing -Cell cycle is required for replication of cells Rao and Johnson Experiment - indicated there is cue that cell gave to cause it to go
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Lecture 19 11 - Lecture 19 11/28/07 Intro to Cell Cycle...

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