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Cells double every 24 hours. Starting from 1 million, roughly how many days until the culture reaches 16 million?

  • A.16 days
  • B.8 days
  • C.2 days
  • D.4 days

Answer: D

Reaching sixteen times the starting number needs four doublings, since two to the fourth is 16, and four doublings at one a day is four days. Cultures are usually split before they reach that density. Exponential growth means the last doubling adds the most cells.

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