Cellular Respiration

AP Biology· difficulty 2/5

When O₂ is unavailable, many cells convert pyruvate to _______ via fermentation in order to regenerate NAD⁺ so glycolysis can continue.

A
$ATP or ADP molecules$
B
$Glucose or fructose$
C
$Lactate or ethanol$
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D
$Water or oxygen gas$

Explanation

Lactic-acid fermentation (animals) and alcoholic fermentation (yeast) regenerate NAD⁺ — without it, glycolysis halts.

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