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Enzymes are proteins functioning as catalysts that speed up reactions by lowering the activation energy. A simple and succinct definition of an enzyme is that it is a biological catalyst that accelerates a chemical reaction without altering its equilibrium.
Enzymes provide an alternative pathway for the reaction to occur faster. They lower the activation energy, but the change in Enthalpy and Gibbs free energy stays the same because they are state properties independent of the pathway.
Enzymes are just biological catalysts. They are able to lower the activation energy for reactions, the lower the activation energy, the faster the rate. The enzymes speed up the reactions by lowering the activation energy.
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