Question

Which of the following statement(s) is (are) correct?

• A. Pyruvate can be converted into ethanol and carbon dioxide by yeast.
• B. Fermentation takes place in aerobic bacteria.
• C. Fermentation is a form of anaerobic respiration.
• D. Both A and C.

Answer 1

The correct option is D Both A and C.

Fermentation is a metabolic process that converts sugar to acids, gases, and/or alcohol. It occurs in yeast and bacteria. Fermentation takes place in the lack of oxygen (when the electron transport chain is unusable) and becomes the cell's primary means of ATP (energy) production. It turns NADH and pyruvate produced in the glycolysis step into NAD+. Fermentation is another name for the production of energy from food without using oxygen. When yeast ferments glucose the process can be represented by the following equation: Glucose ($C_6{H}_{12}{O}_6$) ---- ethanol (2$C{H}_{3}C{H}_{2}OH$) + Carbon dioxide (2$C{O}_2$) + energy.

Hence the correct option is D.