Multiple choice

During oxidative phosphorylation stage of respiration, every NADH2 molecule and every FADH2 molecule oxidized would generate __________ respectively.

  1. 4 and 3 molecules of ATP

  2. 2 and 3 molecules of ATP

  3. 3 and 2 molecules of ATP

  4. 3 and 4 molecules of ATP

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During oxidative phosphorylation, NADH generates approximately 3 ATP molecules through the electron transport chain ( complexes I, III, and IV), while FADH2 generates only 2 ATP molecules because it enters the chain at complex II, bypassing complex I and thus contributing less proton motive force. The total yield per glucose is approximately 36-38 ATP.

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