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MHT CET Medical202624 April 2026Evening ShiftBiologyRespiration in PlantsActual

During lactic acid fermentation, pyruvic acid is reduced to lactic acid using one proton and two electrons from ________________.

Options

  1. ANADH + H ^+ produced during glycolysis.
  2. BFADH ₂ produced in Krebs cycle.
  3. CAcetyl CoA.
  4. DWater.

Correct answer

A. NADH + H ^+ produced during glycolysis.

Step-by-step solution

During lactic acid fermentation, pyruvic acid is reduced to lactic acid by the enzyme lactate dehydrogenase. The reducing agent for this reaction is NADH + H ^+ , which is produced during the oxidation steps of glycolysis. In this process, NADH + H ^+ donates electrons and a proton to pyruvic acid, getting reoxidized to NAD ^+ , which is then reused in glycolysis. Answer: NADH + H ^+ produced during glycolysis.

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