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Question

What is the role of NAD+ in cellular respiration?
  1. It is a nucleotide source for ATP synthesis.
  2. It functions as an enzyme.
  3. It functions as an electron carrier.
  4. It is the final electron acceptor for anaerobic respiration.

A
It functions as an enzyme.
B
It is a nucleotide source for ATP synthesis.
C
It is the final electron acceptor for anaerobic respiration.
D
It functions as an electron carrier.
Solution
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NAD is the electron carrier that picks the electron from other molecules and gets reduced to form NADH. It is thus used as a reducing agent to donate electrons. Thus, the correct answer is option D.


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