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Hypothesis -Hydrogen Peroxide will breakdown to oxygen and water in the presence of Catalase, which will be found in yeast cells. In this experiment my aim is to find out whether or not the increase or decrease in temperature will affect the rate of enzyme action. 1. Temperature - As temperature increases, molecules move faster (kinetic theory). In an enzyme catalysed reaction, such as the decomposition of hydrogen peroxide, this increases the rate at which the enzyme and substrate molecules meet and therefore the rate at which the products are formed. As the temperature continues to rise, however, the hydrogen and ionic bonds, which hold the enzyme molecules in shape, are broken. If the molecular structure is disrupted, the enzyme ceases to function, as the active site no longer accommodates the substrate. The enzyme is denatured. This will be the variable, which I will be testing in order to find the optimum...

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