... in the reactions they catalyse and can be used over and over again, only a very small amount of an enzyme is needed to catalyse a reaction. A reaction will reach its maximum velocity when all the active sites of the enzyme molecules are engaged. A single enzyme can convert around 1000 substrate molecules per second. The rate of reaction will increase as the substrate concentration is increased. When all the active sites available are engaged, the enzyme is said to be saturated. The rate of reaction is determined by the speed at which the active sites can convert substrate to product. In this instance Hydrogen Peroxide to Water and Oxygen. Hydrogen peroxide - symbol equation H2O2 - is a substance that is produced by numerous metabolic reactions. This toxic waste created extensively in mammalian tissues is catalysed by Catalase. Catalase is an enzyme which catalyses the reaction by which ...

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