GCSE Science Enzymes GCSE Science Enzymes 2.0 / 5 based on 1 rating ? BiologyEnzymes and digestionGCSEAQA Created by: Pixie~Flirt (:Created on: 20-11-12 16:12 Enzymes they are proteins biological catalysts - increases rate of reaction each enzyme is specific to substrate substrates are changed into products lock and key theory each enzyme is a different shape within enzyme - active site only one substrate fits into the active site enzymes can be denatured if shape changes then substrate can't fit into active site 1 of 3 Enzymes (Continued) they speed up reactions, lowering 'activation energy' 'activation energy' needed to start reaction factors that affect rate of reaction: temperature, pH, enzyme concentration, substrate concentration, surface area and pressure optimum - where enzymes work best at one particular temperature when enzyme is denatured - temp and pH is not right, causes enzyme to change (irreversibly) affects shape of active site 2 of 3 Enzymes Summary enzymes speed up the rate of reaction enzymes are specific because they only work on one substrate the substrate fits into the active site of the surface of the enzyme enzymes can be re-used so only small amounts are needed enzymes belong to a group of chemical compounds called proteins 3 of 3
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