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If a population of cells doubles every 20 hours, how many cells arise from one cell after 100 hours?

  • A.32
  • B.5
  • C.20
  • D.100

Answer: A

One hundred hours contains five doubling periods, and 2 raised to the fifth power is 32. Growth of this kind is exponential rather than linear, which is why tumours enlarge slowly at first and then rapidly. The same doubling time produces very different absolute increases over time.

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