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FADH2 entering the ETS via Complex II yields how many ATP?
A4 ATP per FADH2 molecule
B2 ATP per FADH2 molecule
C3 ATP per FADH2 molecule
D1 ATP per FADH2 molecule
Answer & Solution
Correct answer: B. 2 ATP per FADH2 molecule
FADH2 bypasses Complex I (no proton pumping there) and feeds electrons directly to ubiquinone via Complex II. Net proton transfer through Complexes III and IV yields about 2 ATP per FADH2.
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