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An Experiment to Investigate the Effect of pH on the Enzyme Peroxidase Introduction: Some by-products of cell metabolism are poisonous so cells need to excrete or break them down quickly to ensure they do not damage the cell. Cells use enzymes to do this. Enzymes are catalysts. This means that they speed up a reaction (by up to a million times faster) without being used up. Hydrogen Peroxide is a by-product of respiration. It is broken down by the enzyme peroxidase to produce oxygen and water. Aim: The aim of this experiment is to investigate the effect of pH on peroxidase. I will test this by measuring how pH affects the rate of reaction between peas (which contain peroxidase) and hydrogen peroxide. I predict that the rate of reaction will be fastest in a neutral pH for the simple reason that peas don't make me ill so they can't be very acidic or alkaline. Method: 1)...

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