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ATP synthase complexes can generate ____ATPs for each NADH that enters electron transport.

  • A.1
  • B.2
  • C.3
  • D.4

Answer: C

Correct answer: 3

Each NADH delivers its electrons at the top of the chain, and their passage down it pumps enough protons to drive roughly 3 ATP through ATP synthase. FADH2, entering lower down at coenzyme Q, yields about 2. (Measured values are closer to 2.5 and 1.5, since the gradient also pays for transport across the membrane.)

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