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Discussion

If a cell cycle lasts 24 hours and mitosis occupies 1 hour, what percentage of the cycle is spent in interphase?

  • A.about 96 per cent
  • B.about 90 per cent
  • C.about 75 per cent
  • D.about 4 per cent

Answer: A

Twenty-three of the twenty-four hours are interphase, which is a little over 95 per cent. The impression that cells are usually dividing comes from mitosis being so much more visible than interphase. A dividing cell is conspicuous, while an interphase nucleus looks quiet.

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