Question

For formation of ethanol, pyruvic acid is first changed to acetaldehyde by enzyme

• A. Pyruvate dehydrogenase
• B. Pyruvate decarboxylase
• C. Alcohol oxidase
• D. Alcohol dehydrogenase

Answer 1

The correct option is B Pyruvate decarboxylase

Alcoholic fermentation employs the conversion of pyruvic acid to ethanol for the release of energy. This is an incomplete oxidation in which aldehyde is first formed as an intermediate which is then further oxidised to alcohol. Pyruvic acid to acetaldehyde conversion is brought about by pyruvate decarboxylase which releases CO2.

So the answer is 'Pyruvate decarboxylase'.