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Background Enzymes are proteins. They are biological catalysts that speed up reactions. An example of enzyme action is digestion, where large food molecules are broken down into simple small molecule that can be absorbed across the gut wall into the blood. Enzymes are said to be specific, that is that the enzyme will only work on one food or substrate to produce the products. All living organisms during their metabolism produce Hydrogen Peroxide as a waste substance in many cells. (The enzyme is found in every living cell). This Hydrogen Peroxide is toxic and very dangerous and so must immediately be broken down into harmless products. For this reason every cell has the enzyme catalase which breaks up the Hydrogen Peroxide into water and oxygen. Catalase + H2O2 H20 + 02 The reason why enzymes can only break down one substrate is because of their active sites. Enzymes are 3 -D proteins which...

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