Biology Enzymes SZABMU 2022
PMDC Verified Question 47 of 79
Enzymes work by lowering the ____ of the reactions they catalyze.
A
Kinetic energy
B
Heat energy
C
Activation energy
D
Potential energy
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Activation energy
Concept:

Every chemical reaction, even highly exergonic ones, requires an initial input of energy to break existing chemical bonds before new ones can form.

Solution:

  • This required initial energy is called activation energy.
  • Enzymes function uniquely as biological catalysts by significantly lowering this activation energy barrier.
  • Because the barrier is lower, the reaction can occur much faster at the mild temperatures found in living organisms.


Why other options are incorrect:

Enzymes do not alter the overall kinetic or potential energy of the system, nor do they cool the reaction by lowering heat energy.

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