to catalyze a reaction, an enzyme must do which of the following? i. raise the free energy of activation to a value above the free energy of the reactants and products. ii. lower the free energy of activation to a value below that of the uncatalyzed reaction. iii. raise the free energy of activation to a value above that of the uncatalyzed reaction. iv. all of the options. v. lower the free energy of activation to a value below the free energy of the reactants and products.