Refer to the Figure Below

question 176

Multiple Choice

Refer to the figure below. NAD⁺ functions as a coenzyme in many enzyme-catalyzed reactions.The changes that take place in this coenzyme are the same for all of these reactions and are illustrated in the figure.It is likely that, in these reactions, NAD⁺

• A) functions as an electron donor in an oxidation-reduction reaction.
• B) functions as an electron acceptor in an oxidation-reduction reaction.
• C) forms a covalent intermediate during covalent catalysis.
• D) induces strain in other substrates bound at active sites.
• E) functions as a base in acid-base catalytic mechanisms.

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