What best describes the role of an enzyme in a reaction?

Question

BlackTom AI · Accepted Answer

To understand what best describes the role of an enzyme in a reaction, we evaluate each statement on thermodynamics and kinetics first.
Option 1: 'An enzyme increases the ΔG of a reaction.' This is incorrect because enzymes do not change the overall Gibbs free energy change (ΔG) of a reaction; they influence the rate at which equilibrium is reached, not the position of equilibrium itself.
Option 2: 'An enzyme decreases the activation energy of the reaction.' This is correct. Enzymes act as biological catalysts that lower the energy barrier (activation energy) required to start the reaction, allowing the rate to increase without altering the final energy difference between reactants and products.
Option 3: 'An enzyme decreases the ΔG of a reaction.' This is also incorrect for the same thermodynamic reason as Option 1: ΔG remains unchanged by enzymes, only the pathway and rate are affected.
Option 4: 'An enzyme converts an endergonic reaction to an exergonic reaction.' This is false because enzymes do not change the fundamental thermodynamic nature of a reaction; an endergonic reaction remains endergonic, and an exergonic reaction remains exergonic, regardless of catalysis.
In summary, the key concept is that enzymes accelerate reactions by lowering the activation energy, not by altering the overall energy change or the thermodynamic classification of the reaction.

What best describes the role of an enzyme in a reaction?Single choice

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