... release of the end product, more substrate molecules can bind with the active site. Therefore, an enzyme is a sort of biological enzyme catalyst. Enzymes are classified into several catagories, such as hydrolytic oxidising and reducing depending on the type of reaction they control hydrolytic enzymes accelerate reactions in which a substance is broken down into simpler compounds through reactions with water molecules oxidising enzymes, know as oxidies acceleate oxidation reactions reducing enzymes speed up reduction reactions, in which oxygen is removed. Catalase is present in the peroxisomes (microbody organelles that have various oxidation reactions in which toxic peroxides are generated as side products) of nearly all aerobic cell so it serves to protect the cell from toxic affects of hydrogen peroxide by catalysing its decomposition into molecular oxygen and water without the production of free radicals (an atom or a group of atoms with an unpaired electron. Radicals are unusually reactive ...

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