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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.
A pH of about 7 is the optimum and as the pH moves further away from the optimum pH the enzyme activity starts to slow down. Every enzyme shows highest activity at a specific temperature which is called the optimum temperature. The rate of reaction above or below this temperature is slower. Increasing the temperature causes the frequency of collisions to increase as the molecules move faster when the heat is supplied.