During lactic fermentation, pyruvic acid is:
A) oxidised
B) phosphorylated
C) decarboxylated
D) reduced
E) dephosphorylated
IMAT 2025 · Question 10
Q10 - Fermentation
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The correct answer is D) reduced.
In lactic fermentation, pyruvate takes electrons from NADH and becomes lactate:
pyruvate + NADH → lactate + NAD⁺
Gaining electrons means pyruvate is reduced. The point of the step is to turn NADH back into NAD⁺ so glycolysis can keep going without oxygen.
Decarboxylation (losing CO₂) belongs to alcoholic fermentation, not lactic, so C doesn't fit.
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