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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.
The optimum pH and optimum temperatures of an enzyme are simply levels that the enzyme work most effectively at. These levels contribute to factors such as the enzyme's protein structure. Different levels of pH and temperature can alter the integrity of the protein, this process is called denaturation.