- A 1 ATP
- B 2.5-3 ATP
- C 10 ATP
- D 0 ATP
Correct answer: B. 2.5-3 ATP
Explanation: Each NADH yields roughly 2.5-3 ATP via the ETC (chemiosmotic oxidative phosphorylation), while each FADH2 yields roughly 1.5-2 ATP, since FADH2 enters the chain at a later, lower-energy point.
Concept context
Glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. The cellular energy-release counterpart to photosynthesis.