Question

The two enzymes present in yeast that an responsible for the formation of ethyl alcohol from molasses in the fermentatiol process are:

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

Answer 1

Answer: (B)

Diastase enzyme is present in barley and it converts starch into maltose. The reactions are: $\underset{\text{Sucrose}}{C_6{H}_{22}{O}_{11}}+H_{2}O\underset{(Yeast)}{\overset{\text{Invertasse}}{\to }}\underset{\text{Fructose}}{C_6{H}_{12}{O}_6}$ $\underset{\text{Fructose}}{+C_6{H}_{12}{O}_6}$ $\underset{\begin{array}{c}\text{Glucoe}\\ \text{Fructose}\end{array}}{C_6{H}_{12}{O}_6}\underset{(Yeast)}{\overset{Zymase}{\to }}2C_2{H}_{5}OH+2C{O}_2$ So, to convert sucrose into ${\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}\text{.}$ invertase and zymase enzymes are required which are present in yeast.