Alcohols Phenols And Ethers Question 177
Question: In the commercial manufacture of ethyl alcohol from starchy substances by fermentation method, which enzymes stepwise complete the fermentation reaction
[BIT 1992]
Options:
A) Diastase, maltase and zymase
B) Maltase, zymase and invertase
C) Diastase, zymase and lactase
D) Diastase, invertase and zymase
Show Answer
Answer:
Correct Answer: A
Solution:
$ \underset{Starch}{\mathop{2{{(C_6H _{10}O_5)} _{n}}}}+nH_2O\underset{\text{(from}germinated\text{barley)}}{\mathop{\xrightarrow{Diastase}}}\underset{Maltose}{\mathop{n(C _{12}H _{22}O _{11})}} $
$ C _{12}H _{22}O _{11}+H_2O\underset{\text{(from}\text{yeast)}}{\mathop{\xrightarrow{Maltase}}}2\underset{Glucose}{\mathop{C_6H _{12}O_6}} $
$ C_6H _{12}O_6\underset{\text{(from}\text{yeast)}}{\mathop{\xrightarrow{Zymase}}}2C_2H_5OH+2CO_2 $
BETA
