ch369_sp11_enz_1_notes - Onwardtochapter6 ( : G<0...

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   Enzymes - Biological Catalysts (with chymotrypsin as an example) Onward to chapter 6 !
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Example of a useful biochemical reaction:   Peptide bond hydrolysis . This reaction is spontaneous ( G < 0). But it takes years without a catalyst.
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Ways to increase reaction rates of slow reactions:       1) increase the temperature (not very practical          for living things).       2) use an  enzyme  as a catalyst to lower the            activation energy of a reaction.
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Protease  - cleaves peptide bonds (example = chymotrypsin). Transferase  - transfers a functional group.     Isomerase  - converts one isomer to another. Ligase  - Joins 2 molecules together.  Example:  DNA ligase.      etc. Some classes of enzymes
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Enzymes accelerate reactions by lowering the energy of  the transition state.  How enzymes work:
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Enzymes  DO NOT  change the amount of product that is present at  equilibrium.
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Clicker question.
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