Which of the following acts as a coenzyme?

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Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

Which of the following acts as a coenzyme?

Explanation:
Coenzymes are small organic molecules that bind to enzymes and help catalyze reactions, often by shuttling electrons or specific groups. FAD fits this role because it’s a flavin nucleotide that cycles between oxidized (FAD) and reduced (FADH2) states, accepting two electrons and two protons during redox reactions and then passing them to other substrates. This redox shuttle function is a classic example of a coenzyme in metabolism. In contrast, ATP is mainly the cell’s energy currency, donating phosphate groups in phosphorylation reactions rather than acting as a helper molecule for enzyme catalysis in the same way. AMP is simply a nucleotide component, not primarily a coenzyme, and cAMP is a signaling molecule that regulates pathways rather than participating directly in enzyme-catalyzed redox or group-transfer reactions. So, FAD is the correct choice because of its established role as a redox-active coenzyme.

Coenzymes are small organic molecules that bind to enzymes and help catalyze reactions, often by shuttling electrons or specific groups. FAD fits this role because it’s a flavin nucleotide that cycles between oxidized (FAD) and reduced (FADH2) states, accepting two electrons and two protons during redox reactions and then passing them to other substrates. This redox shuttle function is a classic example of a coenzyme in metabolism. In contrast, ATP is mainly the cell’s energy currency, donating phosphate groups in phosphorylation reactions rather than acting as a helper molecule for enzyme catalysis in the same way. AMP is simply a nucleotide component, not primarily a coenzyme, and cAMP is a signaling molecule that regulates pathways rather than participating directly in enzyme-catalyzed redox or group-transfer reactions. So, FAD is the correct choice because of its established role as a redox-active coenzyme.

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