January 24, 2007

January 24, 2007 - January 24, 2007 Enzymes Catalysts...

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January 24, 2007 Enzymes Catalysts – substances that speed up a reaction without being permanently  altered Most enzymes are proteins o Proteins are very diverse in structure and functions Lower the energy barrier What initiates a reaction? o Activation energy The amount of energy required to start a reaction Transition-state species o Where does the energy come from? Heat Enzymes Enzymes are Specific o Enzymes only bind to a few reactants o Reactants = substrates o Active site Specific 3-D shape The Effect of Enzymes o Uncatalyzed reaction take much more energy for reaction to take place o Catalyzed reaction is favored because of the lower amount of energy  needed to make the reaction to take place Life at the Active Site o Enzymes orient substrates o Enzymes add chemical groups to substrates o Enzymes can put strain on the substrate Example – lysozyme Why are active sites so specific?
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January 24, 2007 - January 24, 2007 Enzymes Catalysts...

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