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The proton motive force generated by the electron transport chain is used chiefly to ________.

  • A.synthesise ATP through ATP synthase
  • B.reduce NAD+ to NADH
  • C.oxidise glucose to pyruvate
  • D.fix nitrogen

Answer: B

Correct answer: synthesise ATP through ATP synthase

Electron transport pumps protons out, creating a gradient of both charge and pH across the membrane. Protons flowing back in through ATP synthase drive the enzyme, and the same gradient also powers flagellar rotation and some membrane transport.

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