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Inhibition of the decomposition of hydrogen peroxide by the catalase enzyme using copper sulphate. Hydrogen peroxide is broken down by the enzyme catalase into water and oxygen. Enzymes are catalysts that speed up the rate of metabolic reactions. These reactions can take place without the catalyst but take a considerably longer amount of time. Enzymes can either break down larger molecules into smaller molecules or build smaller molecules into larger ones. In the case of hydrogen peroxide, larger molecules are broken down. All enzymes are globular proteins held together hydrogen bonds, ionic bonds and disulphide bridges in a distinct three-dimensional shape and its shape is specific to each enzyme, as one substrate will fit only one active site. This is illustrated in the 'Lock and Key Hypothesis.' The lock and key hypothesis was to explain why enzymes are specific and will only work on particular substrates. The hypothesis tells us that...

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