Enzymes are biological catalysts that ________.

Enzymes act as biological catalysts and increase the rate of a reaction by reducing the activation energy needed to begin a reaction. Enzymes do not use substrate molecules (the starting molecules). They help increase the rate of a reaction. Enzymes are not necessary for the conversion of substrates into products. They just increase the rate of reaction and speed up the formation of the products. Enzymes do not bind to the products. They bind to the substrates to reduce the activation energy and catalyze the reaction.