Question

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

Answer 1

Answer: (B)

diastase, maltase, zymase

Answer 2

The manufacture of ethyI alcohol from starch contains the following steps
(i) Hydroiysis of starch
$2(C_6H_{10}O_5)n + nH_2O {->[50- 60^{\circ}]}$ Diatease $\underset{\text{maltase}}{nC_{12}H_{22}O_{11}}$
This step is called saccharification.
(ii) Fermentation
$\underset{\text{maltase}}{nC_{12}H_{22}O_{11}} + H_2O {->[\text{Maltase}][\text{teast}]} \underset{\text{glucose}}{2C_6H_{12}O_6} {->[\text{Zymase yeast}]} \underset{\text{ethanol}}{2C_2H_5OH} + 2CO_2$