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Function and structure. Enzymes are very efficient catalysts for biochemical reactions. They speed up reactions by providing an alternative reaction pathway of lower activation energy. Like all catalysts, enzymes take part in the reaction - that is how they provide an alternative reaction pathway.
Overview. An enzyme is a protein that speeds up the rate at which a chemical reaction occurs. Enzymes are substrate specific, meaning that each type of enzyme has a specific type of molecule that it affects.The human body needs enzymes to influence the rates at which biological processes occur.A number of diseases occur due to insufficient quantities of specific enzymes.nzymes are substrate specific, meaning that each type of enzyme has a specific type of molecule that it affects. The human body needs enzymes to influence the rates at which biological processes occur. A number of diseases occur due to insufficient quantities of specific enzymes.