Chemistry Reaction Kinetics MDCAT 2010
PMDC Verified Question 79 of 80
Glucose is converted into ethanol by the enzyme present in the yeast:
A
Invertase
B
Sucrase
C
Zymase
D
Urease
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Zymase
Concept:

Fermentation of simple sugars into alcohol is a biochemical process catalyzed by specific biological enzymes.

Formula:

$$ \text{C}_{6}\text{H}_{12}\text{O}_{6} \xrightarrow{\text{Zymase}} 2\text{C}_{2}\text{H}_{5}\text{OH} + 2\text{CO}_{2} $$

Solution:

  • Yeast secretes a complex of enzymes known as zymase.
  • Zymase acts directly on glucose (and fructose), catalyzing its breakdown into ethanol and carbon dioxide.


Why other options are incorrect:

Invertase (sucrase) hydrolyzes sucrose into glucose and fructose. Urease breaks down urea into ammonia and carbon dioxide.

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