Final acceptor of electrons in respiratory chain is____________?
Correct answer: D. Oxygen
- A. NADH
- B. Cytochrome a3
- C. Water
- D. Oxygen
Explanation
Oxygen is the final electron acceptor in the respiratory chain; it combines with electrons and hydrogen ions to form water at the end of oxidative phosphorylation. Students may choose cytochrome a3 because it transfers electrons immediately before oxygen, but it is an electron carrier rather than the final acceptor.
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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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