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If about 4 protons must pass through ATP synthase for each ATP made, how many protons are needed for 30 ATP?

  • A.7.5
  • B.120
  • C.34
  • D.60

Answer: B

Four protons per ATP over thirty molecules requires 120. The ratio is not a whole number in reality, which is one reason ATP yields per glucose are now quoted as approximate. Earlier textbook figures of 36 or 38 ATP per glucose were falsely precise.

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