Question

In lactic acid fermentation the final electron acceptor is

• A. acetaldehyde
• B. ethyl alcohol
• C. NADH
• D. pyruvic acid

Answer 1

The correct option is D pyruvic acid

Lactic acid fermentation occurs in lactic acid bacteria (eg:- Lactobacillus), some fungi and muscles. In lactic acid fermentation, pyruvic acid produced in glycolysis is directly reduced (gain or acceptance of electrons) by NADH to form lactic acid. No ${\mathrm{CO}}_2$ is produced during this process. The enzyme involved in this process is lactic acid dehydrogenase which requires FMN (flavin mononucleotide) and ${\mathrm{Zn}}^{2+}$.