Biology Enzymes PMC 2020
PMDC Verified Question 58 of 79
Enzymes work by lowering the ____ of the reactions they catalyze.
A
Kinetic energy
B
Activation energy
C
Heat 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 B: Activation energy
Concept:

For a chemical reaction to occur, the reactants must overcome an initial energy barrier before they can be converted into products.

Solution:

  • This initial energy hurdle is known as the activation energy.
  • Enzymes stabilize the transition state of the reaction, providing an alternative pathway that requires significantly less activation energy.
  • By doing so, a much larger proportion of molecules have enough energy to react at biological temperatures.


Why other options are incorrect:

Enzymes do not alter the overall kinetic, heat, or potential energy of the reactants or products; they specifically lower the energy required to reach the transition state.

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