Question

Which of the following reactions does not release CO₂?

• A. Alcohol fermentation
• B. Aerobic respiration
• C. Lactic acid fermentation
• D. Amphibolic pathway

Answer 1

Answer: (C)

In lactic acid fermentation, $C{O}_2$ is not released, as there is no step of decarboxylation unlike alcohol fermentation. The alcohol fermentation includes the decarboxylation of pyruvic acid to Acetaldehyde, which is further reduced to ethanol due to the reducing agent NADH (which gets oxidized to NAD⁺. Aerobic respiration (amphibolic pathway) releases CO₂ due to oxidative decarboxylation of pyruvic acid to Acetyl-CoA.