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Unformatted text preview: Lower the Activation Energy How do Enzymes change the speed of reactions?
• Energy of Activation (Ea) NO ENZYME • must be added for a reaction to occur
• enzymes lower the Ea
• increase the # of molecules with sufficient energy
ENZYME .16 Lock and Key Model of Enzyme Action Substrate(s) EnzymeSubstrate
Enzyme – enzymes are "matchmakers" for substrates and enzymes
– have folds and ridges that fit substrates Product(s)
Formed .16b Induced Fit Model of Enzyme Action Substrate + Substrate
– The active site of the enzyme is complementary
in shape to the shape of the substrate only after the substrate is bound. 4.17 q
q Naming Enzymes
named by 1) substrate, 2) rxn catalyzed
end in "ase" Synthetases/Synthases
• make something Glycogen Synthase makes glycogen
• remove electrons
• Cytochrome Oxidase removes electrons from a cytochrome Dehydrogenases
• transfer hydrogen atoms
• Lactate Dehydrogenase transfers H between pyruvate and lactate
• transfer phosphate groups
• Creatine (Phospho) Kinase transfers Pi...
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This note was uploaded on 01/20/2014 for the course KIN 3515 taught by Professor Nelson during the Fall '09 term at LSU.
- Fall '09