Why does NADH yield 3 ATP while FADH₂ only yields 2 ATP? A) NADH has a higher electrochemical potential than FADH₂ B) NADH enters the ETC at complex I while FADH₂ enters it at complex II C) The standard free energy difference between NADH and NAD⁺ exceeds the standard free energy difference between FADH₂ and FAD D) The chemical energy stored in NADH is more than that stored in FADH₂ E) All of the above

Question

Quizplus · Accepted Answer

NADH has a higher electrochemical potential, enters the electron transport chain (ETC) at an earlier point (complex I) than FADH2 (which enters at complex II), and has a greater standard free energy difference and chemical energy content compared to FADH2. These factors collectively contribute to NADH yielding more ATP than FADH2 during cellular respiration.

Why Does NADH Yield 3 ATP While FADH2 Only Yields

Why Does NADH Yield 3 ATP While FADH₂ Only Yields