Question

71. Which of the following enzymes is used to convert glucose into ethyl alcohol?

• A. diastase
• B. maltase
• C. zymase
• D. invertase

Answer 1

The correct option is C

zymase

Explanation of correct option:

Option (C): Zymase is an enzyme used for the fermentation of glucose into Ethyl alcohol.

The reaction involved is: $\underset{\mathrm{Glucose}}{{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6}\stackrel{\mathrm{Zymase}}{\to }2\underset{\mathrm{Ethyl}\mathrm{alcohol}}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}+\underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2}$

Explanation of incorrect options:

Option (A): Diastase is an enzyme that is used for converting starch into maltose sugar.

The reaction involved is: $\underset{\mathrm{Starch}}{{\left({\mathrm{C}}_6{\mathrm{H}}_{10}{\mathrm{O}}_5\right)}_{\mathrm{n}}}+\underset{\mathrm{Water}}{\frac{\mathrm{n}}{2}{\mathrm{H}}_2\mathrm{O}}\stackrel{\mathrm{Diastase}}{\to }\frac{\mathrm{n}}{2}\underset{\mathrm{Maltose}}{{\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}}$

Option (B): Maltase is an enzyme that is used for the fermentation of starch which is in the form of maltose into glucose.

The reaction involved is: $\underset{\mathrm{Maltose}}{{\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}\stackrel{\mathrm{Maltase}}{\to }2\underset{\mathrm{Glucose}}{{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6}$

Option (D): Invertase is an enzyme that is used for the conversion of sucrose into glucose and fructose.

The reaction involved is: $\underset{\mathrm{Sucrose}}{{\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}\stackrel{\mathrm{Invertase}}{\to }\underset{\mathrm{Glucose}}{{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6}+\underset{\mathrm{Fructose}}{{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6}$

Hence, option (C) is the correct answer. Zymase enzyme is used to convert glucose into ethyl alcohol