Discussion
The FADH2 formed during the TCA cycle enters the electron transport system at which site?
Answer: C
Correct answer: coenzyme Q
FADH2 is bound to succinate dehydrogenase, which sits in the membrane as Complex II and passes its electrons straight to coenzyme Q - entering the chain below NADH dehydrogenase. It therefore bypasses one proton-pumping site, which is why FADH2 yields about 2 ATP against NADH’s 3.
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