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I may be able to carry out an investigation into the rate at which substrate is converted into product during an enzyme-controlled reaction. In a specific enzyme controlled reaction, the substrate molecules combine with the active site of an enzyme, as in all hydrolysis reactions, water participates in the breakdown, with the release of 'products' which diffuse back into the environment around the active site. The process continues as long as there are substrate molecules to be converted, as the enzyme molecule is unchanged at the end of the reaction. The enzyme itself is found in the tissues of most living things and catalyses the breakdown of hydrogen peroxide into water oxygen. It is an easy reaction to follow as the oxygen that is released can be collected and measured. For example looking at the diagram below:- Enzyme concentration At low enzyme concentration there is great competition for the active sites...

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