Multiple Choice
NAD\(^+\), NADP\(^+\), and which of the following are cofactors that participate in the reactions of cellular respiration?
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8. Respiration
Introduction to Cellular Respiration
Multiple Choice
As glucose is oxidized during cellular respiration, the coenzyme NAD\(^+\) accepts two electrons and is:
A
converted to FADH\(_2\)
B
hydrolyzed to ADP
C
oxidized to NADH\(_2\)
D
reduced to NADH
Verified step by step guidance1
Understand the role of NAD\(^+\) in cellular respiration: NAD\(^+\) is a coenzyme that acts as an electron carrier during the process of cellular respiration. It plays a critical role in transferring electrons from one molecule to another.
Recall the concept of oxidation and reduction: Oxidation involves the loss of electrons, while reduction involves the gain of electrons. In this case, NAD\(^+\) gains electrons during cellular respiration.
Examine the chemical change: NAD\(^+\) accepts two electrons and one proton (H\(^+\)), which reduces it to NADH. This is a reduction reaction because NAD\(^+\) gains electrons.
Compare NADH with other molecules mentioned in the options: FADH\(_2\) is another electron carrier, but it is not formed directly from NAD\(^+\). ADP is a product of ATP hydrolysis, unrelated to NAD\(^+\). NADH\(_2\) is not a correct term; NADH is the proper reduced form of NAD\(^+\).
Conclude that NAD\(^+\) is reduced to NADH during cellular respiration, as it gains electrons and a proton in the process.
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