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Shimon Simon 10SI 10/07/2002 Biology Coursework What Affects the Enzyme Catalase? Background information: An enzyme is a large protein that acts as a biological catalyst and which changes the rate of a reaction. It provides an active site which is an environment where a reaction can take place this is made up of amino acids. The structure and shape of the substrate, the structure and shape of an enzyme and the substance upon which the enzyme works all have to match exactly. This enables the substrate to bind, but it can't do this if the shapes of the two are different. An enzyme itself will not be affected by the reaction and if the reactants are released the enzyme can be bound with a new substrate. The enzyme I am investigating is catalase. Catalase is made in all organisms including yeast cells which will be used for my experiment. Catalase breaks down...

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