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ATP synthase produces ATP as protons

  • A.flow back down their gradient through it
  • B.are pumped outward against their gradient
  • C.combine chemically with phosphate ions
  • D.are converted into hydrogen molecules

Answer: A

The flow turns a rotor, and that mechanical rotation drives the chemistry at the catalytic head. It is one of the few molecular machines that genuinely rotates. Each full turn of the rotor yields three molecules of ATP.

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