Answers to PracticeQuestions_18

Answers to PracticeQuestions_18 - Answers to Chapter 18...

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Answers to Chapter 18 Sample questions 1. S, G2, M, S, M, G1, S, G2, DNA 2. d 3. b 4. b 5. A. True. In nearly all cells in an organism, the S, G 2 , and M phases of the cell cycle take similar amount of time. The different timing of cell division in different cell types is due to variable lengths of the G 1 phase or to withdrawal into the G 0 state. B. False. The cell-cycle control system does use a timing mechanism of sorts, but it also employs various surveillance and feedback mechanisms (checkpoints). Cells will not embark on later events or phases until the earlier events or phases have been completed successfully. In response to a defect or a delay in a cell-cycle event, cells engage molecular brakes to arrest the progression of the cell cycle at various checkpoints, to allow time for completion or repair. 6. a 7. c 8. egg, G2, short, synchronously, oscillate, Cdk, cyclin, stimulatory, conserved, able 9. c 10. b 11. 5, 6, 3, 2, 4, 1, 7, 8 12. a 13. In G 0 the cell-cycle control system is partly dismantled, so that some of the Cdks and cyclins are not present. Cells paused in G
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