01 - 1) -The cell-cycle control system is a system that...

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1) -The cell-cycle control system is a system that regulates the complete cycle of cell division from interphase to the M-phase with stop and go-ahead signals of molecules. -The cell-cycle control system uses checkpoints at the end of G 1 , G 2 , and M phases. -The purpose of the check points is to ensure that cell did everything that was supposed to be done before reaching checkpoint properly and correctly. -For example, muscle cells NEVER divide. They finish G 1 of interphase, and don’t pass the first checkpoint, and retire to an inactive phase called G 0 phase. -Checkpoints are simulated (or not simulated) by external and internal signals. Internal Signals -If any kinetochore is not yet attached to a microtubule, anaphase will be delayed by molecular signals that the kinetochore sends out. External Signals - dehydration-dependent inhibition happens when cells stop dividing due to an overcrowding of cells because nutrients cannot support any more cells. -
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This note was uploaded on 10/02/2011 for the course BIO 210 taught by Professor Lee during the Spring '11 term at San Mateo Colleges.

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01 - 1) -The cell-cycle control system is a system that...

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