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Biology Assignment Enzymes * Enzymes are globular proteins that act as biological catalysts. * They speed up chemical reactions that would otherwise occur very slowly at the temperature within cells. * The precise three-dimensional enzyme has a depression on its surface called the active site. This site may be a relatively small part of the large protein. * Only a few amino acids may be directly involved in the active site, with the remainder of the molecule maintaining the three dimensional shape of the protein molecule. Lock and Key theory * Either a single molecule with a complementary shape, or more than one molecule that together have a complementary site can fit into the active site. * These substrate molecules form temporary bonds with the amino acids of the active site to produce an enzyme substrate complex. * The enzyme holds the substrate molecules in such a way that they react more easily. * When...

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