question_answer

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                  

Correct Answer: B

Solution :

                                Diastase enzyme is present in barley and it converts starch into maltose. The reactions are: \[\underset{\text{Sucrose}}{\mathop{{{C}_{6}}{{H}_{22}}{{O}_{11}}}}\,+{{H}_{2}}O\xrightarrow[(Yeast)]{\text{Invertasse}}\underset{\text{Fructose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,\] \[\underset{\text{Fructose}}{\mathop{+{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,\]                 \[\underset{\begin{smallmatrix}  \text{Glucoe}\, \\  \text{Fructose} \end{smallmatrix}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,\xrightarrow[(Yeast)]{Zymase}2{{C}_{2}}{{H}_{5}}OH+2C{{O}_{2}}\] 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.