Question:

\(\mathrm{C_{12}H_{22}O_{11}+H_2O\ \xrightarrow{\text{Enzyme A}}\ \underset{\text{Glucose}}{C_6H_{12}O_6}+\underset{\text{Fructose}}{C_6H_{12}O_6}}\)
\(\mathrm{\underset{\text{Glucose}}{C_6H_{12}O_6}\ \xrightarrow{\text{Enzyme B}}\ 2C_2H_5OH+2CO_2}\)
In the above reactions, the enzyme A and enzyme B respectively are :

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Sucrose is hydrolysed by invertase; glucose is fermented to ethanol by zymase.
Updated On: Nov 4, 2026
  • Zymase and Invertase
  • Invertase and Amylase
  • Amylase and Invertase
  • Invertase and Zymase
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The Correct Option is D

Solution and Explanation

Reaction 1: sucrose \(\mathrm{C_{12}H_{22}O_{11}}\) + water gives glucose + fructose (inversion of sucrose). The enzyme that catalyses this is invertase (sucrase). So A = invertase.
Reaction 2: glucose is converted into ethanol and carbon dioxide (fermentation). The enzyme complex responsible is zymase (present in yeast). So B = zymase.
(Amylase hydrolyses starch to maltose, so it does not fit either step.)
Answer: (4) Invertase and Zymase
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