Glucose is converted to_before entering the Krebs cycle:
Correct answer: C. Acetyl CoA
- A. Pyruvate
- B. Lactic acid
- C. Acetyl CoA
- D. Ethanol
Explanation
Before entering the Krebs cycle, pyruvate is converted to acetyl-CoA in a process known as pyruvate oxidation. This step links glycolysis (which occurs in the cytoplasm) with the Krebs cycle (which occurs in the mitochondria).
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About Bioenergetics
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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Acetyl CoA is completely oxidized to carbon dioxide and liberates: