In a reaction coordinate diagram showing free energy versus reaction progress, which curve represents the reaction pathway in the presence of an enzyme?

• A. The curve that changes the overall free energy change of the reaction so that $\Delta G<0$ for a reaction that was previously $\Delta G>0$
• B. The curve with the higher activation energy barrier ($E_a$) but the same overall free energy change ($\Delta G$) as the uncatalyzed reaction
• C. The curve with the lower activation energy barrier ($E_a$) while having the same overall free energy change ($\Delta G$) as the uncatalyzed reaction
• D. The curve that has the same activation energy barrier ($E_a$) but a smaller magnitude of $\Delta G$ than the uncatalyzed reaction

Answer: (C)