Question

What amount of energy is released from glucose during lactic acid fermentation:

• A. More than $18\%$
• B. Less than $7\%$
• C. Approximately $15\%$
• D. About $10\%$

Answer 1

The correct option is B Less than $7\%$

Fermentation usually happens in yeast cells and bacteria. Also, the animal muscle cells show lactic acid fermentation in case of inadequate oxygen supply. In both lactic acid and alcohol fermentation not much energy is released, less that $7\%$ of energy in glucose is released out and not all of it is trapped in high energy bonds.

In yeast, there is incomplete oxidation of glucose that happens in an anaerobic environment. Here, pyruvic acid is converted into carbon dioxide and ethanol.

Some bacteria produce lactic acid from pyruvic acid by means of lactic acid fermentation.


So, the correct answer is "option B"