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Enzymes Enzymes are catalysts. Most are proteins. (A few rib nucleoprotein enzymes have been discovered and, for some of these, the catalytic activity is in the RNA part rather than the protein part. Link to discussion of these ribozymes.) Enzymes bind temporarily to one or more of the reactants of the reaction they catalyses. In doing so, they lower the amount of activation energy needed and thus speed up the reaction. Examples: * Catalyse. It catalyses the decomposition of hydrogen peroxide into water and oxygen. 2H2O2 -> 2H2O + O2 One molecule of catalyse can break 40 million molecules of hydrogen peroxide each second. * Carbonic anhydrase. It is found in red blood cells where it catalysis the reaction CO2 + H2O <-> H2CO3 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 CO2...

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