Draw and label a graph to illustrate the effects of an enzyme on the activation energy of an exergonic reaction and an endergonic reaction. Refer to your graphs to explain why the addition of an enzyme will not change the ∆G of either type of reaction.

The addition of an enzyme does not change the ∆G (free energy change) of either type of reaction because enzymes only facilitate the kinetics of reactions by lowering the activation energy barrier, making it easier for reactions to occur, but they do not alter the thermodynamics or the overall energy change of the reactions. ∆G remains the same before and after the addition of an enzyme.