Anaerobic respiration releases much less energy per glucose than aerobic respiration because
Correct answer: A. glucose is only partially oxidised, leaving energy locked in products such as lactate
- A. glucose is only partially oxidised, leaving energy locked in products such as lactate
- B. glycolysis does not occur without oxygen
- C. oxygen directly destroys ATP molecules
- D. the enzymes of respiration denature without oxygen
Explanation
Without oxygen as the final acceptor, the Krebs cycle and electron transport chain stop, so products such as lactate or ethanol still hold most of glucose's energy. Glycolysis itself runs normally, which is why a small yield of 2 ATP is still obtained.
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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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