... cell where it occurs because hydrogen peroxide would poison and kill the cells. The potato enzyme will force the hydrogen peroxide to decompose into water and oxygen. This is a natural process that occurs and will carry on reacting until the substrate runs out. The enzyme does not run out and the surface area of the potato is directly proportional to the amount of enzyme as enzyme is present in every cell of potato. If a substrate finds an enzyme it will try to fix into it's active site, this is called 'complex'. If the enzyme does not fit, it cannot be broken down. When the enzyme fits into the substrate, a reaction will occur .The enzyme chemically rearranges the molecules, and breaks the substrate into small soluble products. If the experiment contains too much acid the Ph level will drop. Therefore the enzyme will denature. Letts educational GCSE science classbook Encarta 98 ...

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