The final acceptor of electrons in aerobic respiration is
Correct answer: C. molecular oxygen
- A. water
- B. carbon dioxide
- C. molecular oxygen
- D. NAD
Explanation
Oxygen takes the electrons at the end of the chain and combines with protons to form metabolic water, which is why respiration stops within seconds when oxygen is cut off. Water is therefore the product, not the acceptor, which is the trap in this question. NAD is an intermediate carrier that passes electrons on rather than holding them.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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