Before entering into Krebs cycle, the pyruvate is first decarboxylated and oxidized into:
Correct answer: D. Acetic acid
- A. Alpha ketoglutaric acid
- B. Citric acid
- C. Glyceric acid
- D. Acetic acid
Explanation
Before entering the Krebs cycle, pyruvate is first decarboxylated and oxidized into acetyl-CoA. Acetyl-CoA is a two-carbon molecule that is the starting point for the Krebs cycle.The decarboxylation of pyruvate is a reaction that removes a carbon dioxide molecule from pyruvate. This reaction is catalyzed by the pyruvate dehydrogenase complex, which is an enzyme complex that is found in the mitochondrial matrix.The oxidation of pyruvate is a reaction that removes two electrons from pyruvate. These electrons are transferred to NAD+, which is reduced to NADH.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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