Which of the following occurs in anaerobic respiration but not in aerobic respiration?
Correct answer: D. Production of ethanol from acetaldehyde
- A. Release of CO2
- B. Reduction of NAD
- C. Formation of ATP
- D. Production of ethanol from acetaldehyde
Explanation
In alcoholic fermentation, acetaldehyde accepts hydrogen from reduced NAD and is converted into ethanol, regenerating NAD for glycolysis. Aerobic respiration also forms ATP and reduces NAD during earlier stages, whereas ethanol production is specific to this anaerobic pathway. Students may choose c because ATP formation is associated with respiration generally, but it is not unique to anaerobic respiration.
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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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