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Enzymes are catalysts. Most are proteins. (A few ribonucleoprotein enzymes have been discovered and, for some of these, the catalytic activity is in the RNA part rather than the protein part--ribozymes.)

Enzymes bind temporarily to one or more of the reactants ¡ª the substrate(s) ¡ª of the reaction they catalyze. In doing so, they lower the amount of activation energy needed and thus speed up the reaction.

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