Question Detail
Question
The sequence of transfer of electrons during biological oxidation of a substrate in mitochondrion is
Correct Answer
Option C is the correct answer.
Detailed Explanation
The correct sequence of electron transport in the mitochondrial electron transport chain is: NADH (or FADH2) donates electrons to the chain, which then pass through a series of carriers: NADH dehydrogenase (Complex I) or succinate dehydrogenase (Complex II) → Coenzyme Q → Cytochrome b (Complex III) → Cytochrome c → Cytochrome a + a3 (Complex IV) → molecular oxygen (O2). This matches option C: NAD > FAD > Cytochrome b > Cytochrome c > Cytochrome a3 > O2.
Hint
Recall the order of electron carriers from the entry points (NADH, FADH2) to the final electron acceptor.