The Final Step of the Citric Acid Cycle Oxidizes Malate

question 27

Multiple Choice

The final step of the citric acid cycle oxidizes malate to oxaloacetate and reduces NAD⁺. What is the purpose of this step?

• A) to replenish the supplies of NAD⁺
• B) to replenish free CoA
• C) to regenerate oxaloacetate to attach another acetate molecule
• D) to produce ATP by substrate-level phosphorylation
• E) to produce ATP by oxidative phosphorylation

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