Biology Enzymes ETEA 2023
PMDC Verified Question 21 of 79
All of the following are related to enzymes except:
A
Remain unchanged after reaction
B
Speed up reaction
C
Increase the activation energy
D
Possess the active site
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Increase the activation energy
Concept:

Enzymes are biological catalysts. Their entire thermodynamic function is to make reactions easier to achieve, not harder.

Solution:

  • Enzymes speed up chemical reactions.
  • They possess an active site where the substrate binds.
  • They remain structurally unchanged at the end of the reaction, ready to be used again.
  • However, they function strictly by lowering the activation energy barrier. They NEVER increase the activation energy.


Why other options are incorrect:

Remaining unchanged, speeding up the reaction, and possessing an active site are all fundamental, factual properties of enzymes. Increasing activation energy is the exact opposite of what a catalyst does.

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