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Oxygen's role at the end of the electron transport chain is to

  • A.pump protons across the membrane
  • B.carry ATP out into the cytosol
  • C.accept electrons and form water
  • D.donate electrons to the first complex

Answer: C

Without a final acceptor the carriers would remain reduced and the chain would stop, which is why respiration fails without oxygen. Combining with electrons and protons yields water as the product. This is the water formed as the end product of aerobic respiration.

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