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Unformatted text preview: 3.6 Enzymes 1. In cells enzymes are needed because they enable reactions to occur at incredible speeds, in an orderly manner, yielding products that the organism requires when they are needed. 2. In a reaction catalyzed by an enzyme, the starting substance is called the substrate and then its converted to the product. Then enzyme binds to the substrate molecule at a specially formed pocket in the enzyme which is called the active site. 3. Substrate starting substance Active site the binding point where the enzyme binds to the substrate. 4. Enzymes are very specific in their action as they catalyze only one type of reaction or only a very small group of highly similar reactions. This means that the enzymes recognize a very small group of substrate molecules or even only a single type of molecule. This is because the active site where the substrate molecule binds has a precise shape and distinctive chemical properties. Only particular substrate molecules are attracted to a particular active site and can fit there. All other substrate molecules are unable to fit and so cannot bind. The enzyme is the active site and can fit there....
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- Fall '08
- Enzyme, substrate molecules