Question

What is the role of NA$D^{}$⁺ in cellular respiration?

• A. It is a nucleotide source for ATP synthesis
• B. It functions as a electron carrier
• C. It functions as an enzyme
• D. It is the final electron acceptor for anaerobic respiration

Answer 1

The correct option is B It functions as a electron carrier

NA$D^{}$⁺ (Nicotinamide adenine dinucleotide) is a coenzyme found in all cells. It is an electron carrier used to temporarily store energy during cellular respiration. This is found in two forms in cells: NAD⁺ is an oxidizing agent – it accepts electrons from other molecules and becomes reduced. This reaction forms NADH, which can then be used as a reducing agent to donate electrons. These electron transfer reactions are the main function of NA D⁺.