... Enzymes are also sensitive to pH, different enzymes have different pH optimums which are determined by their surroundings e.g. pepsin found in the stomach has an optimum of around pH 2 as the stomach is a very acidic part of the body. Without enzymes reactions would be so slow life couldn't exist. Factors that effect enzymes: * pH change * Temperature change * Concentration of enzyme * Concentration of substrate * Volume of substrate * Volume of enzyme In this experiment I will be using the enzyme catalase. Catalase is used to break down hydrogen peroxide (H2O2) into oxygen and water. Hydrogen peroxide is produced during metabolism therefore is found in every living cell, if no catalase is present the hydrogen peroxide will build up in the cell and poison it. As catalase is found in all living cells good sources can be found in things like blood and potatoes; we will be using potatoes as they ...

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