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Digestion Of Gelatin On Exposed Photographic Film Introduction Enzymes are biological catalysts, that speed up the rate of a chemical reaction at low temperatures (Body temperature) without being changed or used up themselves. How Enzymes Work Enzymes are proteins that behave as catalysts. They speed up biological reactions but remain unchanged by the reaction. The enzyme is shown in blue and the molecule to be broken up (the substrate molecule) is show in red. The enzyme contains an active site. Part of the substrate molecules fits into this site like a key fitting into a lock. This allows bonds in the molecules to break. The temperature affects the rate of reaction, as the temperature increases so does the rate of reaction this is because the substrate molecules are given extra kinetic energy from the source of heat, which enables them to move round faster which consequently means that the chances of the substrate molecules...

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