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BI+107+Chapter+8+(enzymes)

BI+107+Chapter+8+(enzymes) - Chapter 8(second half Enzymes...

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Chapter 8 (second half) Enzymes
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Fig. 8-13 Sucrose (C 12 H 22 O 11 ) Glucose (C 6 H 12 O 6 ) Fructose (C 6 H 12 O 6 ) Sucrase
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Enzymes are Proteins Enzymes catalyze biological reactions Not consumed, reused many times Specific for the substrate Active site is where the substrate binds the enzyme. The enzyme brings together the various reactants and provides a favorable environment for the reaction.
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Enzymes are Proteins Enzymes work by lowering the energy of activation of a reaction. See slide later in presentation for the details of how this is done. Enzymes often end with –ase, The name may tell you the substrate for the reaction or which type of reaction the enzyme catalyzes
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Examples of Enzymes Catalase is an enzyme that catalyzes the reaction H 2 O 2 O 2 + H 2 O Each enzyme catalyzes 93,000 reactions per second. Acetylcholinesterase breaks down acetylcholine in the nerve endings where they meet the muscle. Each enzyme catalyzes 25,000 reactions per second.
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Activation Energy Activation energy is the amount of energy that has to be added to the reactants to get them to convert to products. Lowering the activation energy makes a reaction go faster but it does not make a reaction proceed that wouldn’t be able to proceed otherwise.
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