Question

The process of fermentation in animal cells produces

• A. Acetyl Co-A
• B. Alcohol
• C. Carbon dioxide
• D. Pyruvic acid
• E. Lactic acid

Answer 1

The correct option is E Lactic acid

• Most animal cells regenerate NAD${}^{+}$ without decarboxylation. For example, lactate dehydrogenase enzyme reduces pyruvic acid to lactic acid when oxygen is inadequate for cellular respiration in muscle cells during exercise. Here NADH+H${}^{+}$ is reoxidised to NAD${}^{+}$.
  
• Alcohol and carbon dioxide are the products of yeast fermentaion.
  
• Pyruvic acid and acetyl Co-A are produced by glycolysis and Kreb's cycle respectively.