Question

The fermentation of glucose by yeast normally yields

• A. Lactic acid, ${\mathrm{CO}}_2$, and $2$ ATP
• B. Alcohol, ${\mathrm{CO}}_2$ and $36$ ATP
• C. Alcohol, ${\mathrm{CO}}_2$, and $2$ ATP
• D. ${\mathrm{CO}}_2$, ${\mathrm{H}}_2\mathrm{O}$, and $36$ ATP

Answer 1

The correct option is C

Alcohol, ${\mathrm{CO}}_2$, and $2$ ATP

The explanation for the correct option :
(B) Alcohol, ${\mathrm{CO}}_2$, and $2$ ATP

• Fermentation of glucose is a metabolic reaction.
• It involves many prokaryotic organisms and unicellular eukaryotes like yeast.
• Anaerobic conditions are required for the fermentation process to complete.
• The presence of oxygen causes complete oxidation of glucose and yields different products like pyruvate and energy.

Reaction:

$$\begin{gathered} {\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\left(\mathrm{aq}\right)\stackrel{\mathrm{Yeast}}{\to }2{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\left(\mathrm{I}\right)+2{\mathrm{CO}}_2\left(\mathrm{g}\right) \\ \left(\mathrm{Glucose}\right)\left(\mathrm{Eth}a\mathrm{nol}\right)(\mathrm{Carbon}\mathrm{dioxide}) \end{gathered}$$

An illustrative diagram of fermentation of glucose :

The explanation for incorrect options:

As the product of fermentation of glucose is alcohol, ${\mathrm{CO}}_2$ and $2$ ATP, therefore options A, B and D stand incorrect.

Hence, option C stands correct.