AQA A-Level Biology 2025/6

Biology • A-Level

Question 1 of 40

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Which of the following correctly describes the fate of one molecule of pyruvate during the link reaction that connects glycolysis to the citric acid cycle?

Hint: Consider the enzymes of the pyruvate dehydrogenase complex and the products they generate.

It is decarboxylated, NAD⁺ is reduced to NADH, and CoA is attached to form acetyl‑CoA while CO₂ is released It is phosphorylated to phosphoenolpyruvate, producing ATP directly It is reduced to lactate, regenerating NAD⁺ for glycolysis It is converted directly into oxaloacetate, releasing CO₂

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