In Step 4 of the Citric Acid Cycle, the Reduction

question 63

Multiple Choice

In step 4 of the citric acid cycle, the reduction of NAD⁺ to NADH is coupled to the generation of CO₂ and the formation of a high-energy thioester bond.Which molecule provides the sulfhydryl group necessary to form the thioester bond?

• A)pyruvate
• B)acetyl CoA
• C)CoA
• D)cysteine side chain in the catalytic pocket

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