Which of the following is the source of the carbon atom in the CO₂ produced when oxalosuccinate is converted to α-ketoglutarate in step 3 of the citric acid cycle?

Question

Quizplus · Accepted Answer

The carbon atom in the CO₂ produced when oxalosuccinate is converted to α-ketoglutarate in step 3 of the citric acid cycle comes from the original oxaloacetate. The oxalosuccinate is formed by the condensation of oxaloacetate and acetyl CoA, but in the subsequent steps, the acetyl CoA is completely oxidized to carbon dioxide and water, while the oxalosuccinate is converted back to oxaloacetate, which is then used in another round of the cycle.

Which of the Following Is the Source of the Carbon