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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