Synthesis Enzymes Enzymes are catalysts. Most are proteins .
Enzymes bind temporarily to one or more of the reactants of the reaction they catalyze.
In doing so, they lower the amount of activation energy needed and thus speed up the reaction. It catalyzes the decomposition of hydrogen peroxide into water and oxygen. It enables red blood cells to transport carbon dioxide from the tissues to the lungs. One molecule of carbonic anhydrase can process one million molecules of CO 2 each second. Enzyme activity can be analyzed quantitatively.