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(D) In the process of aerobic respiration,pyruvic acid produced during glycolysis enters the mitochondrial matrix. Before entering the Krebs cycle (Tr

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Acetyl $CoA$

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(D) In the process of aerobic respiration,pyruvic acid produced during glycolysis enters the mitochondrial matrix. Before entering the Krebs cycle (Tricarboxylic Acid Cycle),pyruvic acid undergoes oxidative decarboxylation to form Acetyl $CoA$. This reaction is catalyzed by the pyruvate dehydrogenase complex in the presence of $NAD^+$ and $CoA$. Acetyl $CoA$ then combines with oxaloacetic acid $(OAA)$ to form citric acid,which is the first step of the Krebs cycle.

Before combining with oxaloacetic acid in the Krebs cycle,pyruvic acid is converted into ......

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