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Cellular Respiration

AP Biology· difficulty 3/5

Yeast Pyruvate ↓ -CO2 Acetaldehyde ↓ NADH→NAD+ Ethanol Muscle Pyruvate ↓ NADH→NAD+ Lactate

Which is a key difference between alcoholic and lactic acid fermentation?

  • A

    Alcoholic uses NAD+ but not NADH

  • B

    Alcoholic releases CO2; lactic acid does not

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  • C

    Lactic acid produces ATP; alcoholic does not

  • D

    Lactic acid uses O2; alcoholic does not

Explanation

Alcoholic fermentation includes a decarboxylation step (pyruvate → acetaldehyde + CO2). Lactic acid fermentation simply reduces pyruvate to lactate, releasing no CO2.

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