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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.
Enzymes work fastest when they are at the optimum temperature, but as the temperature gets lower the enzymeâs activity begins to decrease. Enzyme activity can be stopped by adding a molecule that binds to and blocks the enzyme. Lowering the temperature increases the effectiveness of some of these inhibitor molecules. Each enzyme has a special part called an active site, which is like a mouth.