What is the end product of the ETC in animals?
Correct answer: D. Both ATP and Water
- A. ATP
- B. Carbon dioxide
- C. Water
- D. Both ATP and Water
Explanation
The correct answer is 'Both ATP and Water.' The Electron Transport Chain (ETC) is the final stage of cellular respiration where the majority of ATP is synthesised. Oxygen serves as the final electron acceptor in the ETC, combining with electrons and protons to form water. This process not only generates water but also results in the production of approximately 34 ATP molecules. Option A (ATP) is partially correct as ATP is produced, but not the only product. Option B (Carbon dioxide) is incorrect because carbon dioxide is a byproduct of the Krebs cycle, not the ETC. Option C (Water) is also partially correct, as water is indeed formed, but ATP is also produced.
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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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