End product of citric acid cycle is:
Correct answer: C. CO2
- A. Pyruvate
- B. CO2 and H2O
- C. CO2
- D. Lactic acid
Explanation
The correct answer is CO2. The citric acid cycle, also known as the Krebs cycle, plays a crucial role in cellular respiration. During the cycle, acetyl-CoA undergoes oxidation, leading to the release of carbon dioxide (CO2) as a waste product. While CO2 is the direct product of this cycle, water (H2O) is primarily formed during the later stages of cellular respiration, specifically in the electron transport chain. Pyruvate is a precursor to the cycle, being converted into acetyl-CoA, while lactic acid is a product of anaerobic processes, not the citric acid cycle.
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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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