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What is the role of NAD+ in cellular respiration?

1. It functions as an enzyme.
2. It functions as an electron carrier.
3. It is the final electron acceptor for anaerobic respiration.
4. It is a nucleotide source for ATP synthesis.

Correct answer: It functions as an electron carrier.

Solution

NAD+ accepts electrons and hydrogen ions during cellular respiration, becoming NADH. This makes it an electron carrier that shuttles energy to the electron transport chain, rather than acting as an enzyme or final electron acceptor.

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