question_answer

Starch is converted to ethanol by fermentation, the sequence of enzymes used are:

A)  amylase, maltase, zymase

B)  diastase, maltase, zymase

C)  amylase, invertase, zymase

D)  amylase, zymase, maltase

Correct Answer: B

Solution :

The manufacture of ethyl alcohol from starch contains the following steps: (1) Hydrolysis of starch: \[2\,{{({{C}_{6}}{{H}_{10}}{{O}_{5}})}_{n}}+n{{H}_{2}}O\xrightarrow[50-{{60}^{o}}C]{diastase}\underset{maltose}{\mathop{n{{C}_{12}}{{H}_{22}}{{O}_{11}}}}\,\] This Step is called saccharification. (2) Fermentation:    \[\underset{ethanol}{\mathop{2{{C}_{2}}{{H}_{5}}OH}}\,+2C{{O}_{2}}\]