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Enzyme catalysis is the increase in the rate of a chemical reaction due to the presence of an enzyme. Enzymes are biological catalysts that are typically proteins. They work by providing an alternative pathway for a reaction to occur, which has a lower activation energy than the uncatalyzed reaction. This means that the reaction can occur more quickly at a lower temperature. Enzymes are highly specific for their substrates, and each enzyme typically catalyzes only one or a few reactions. Enzyme catalysis is essential for life, as it allows for the efficient and controlled occurrence of chemical reactions in cells.