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Effect of temperature on the action of an enzyme Introduction Enzymes are catalysts that speed up biochemical reactions. Most compounds found in cells are very stable and without enzymes would not react at any useful rate. Enzymes are proteins. Their molecular shape is important, because the enzyme needs to form a precise fit with the substrate - the molecule or molecules involved in the reaction. Only a small part of the enzyme makes contact with the substrate; this part is known as the active site. The shape of the active site allows the substrate to fit perfectly, and to be held in place by temporary bonds, which form between the substrate and some of the R groups of the enzymes amino acids. This combined structure is termed the enzyme-substrate complex. The enzyme may catalyse a reaction in which the substrate molecule is split into two or more molecules. Alternatively, it may catalyse the joining...

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