Lecture4-2009 - Rate of Chemical Reactions A B C D fast(1...

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Rate of Chemical Reactions (1) Reactant concentration (high conc barb2right fast) (2) Temperature (=molecular motion) (3) Activation energy ( Δ G*, low barb2right fast) (4) Presence of a catalyst (=enzyme) A + B C + D An example of enzyme action to support animal physiology barb2right two amphibians with different jumping capabilities Leopard frog ( Rana pipiens ) Western toad ( Bufo boreas ) vs. Answer : LDH levels in leg muscles barb2right for anaerobic ATP production
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Enzyme (=biological catalyst) – has the most important role in regulating chemical reactions Role of enzyme in this reaction barb2right lower the activation energy of rxn barb2right increase the velocity of rxn S barb2right barb2rightbarb2right barb2rightbarb2right S* barb2right barb2right barb2right P S barb2right S* barb2right P (+ Enz.) Activation energy, Δ G* = -2.3RT log ([S*]/[S]) = -2.3RT log K* Activation E. Enzymes, General Properties barb2right head2right Specificity head2right Temp & pH head2right Allosteric modulation S + E barb2right ES barb2right P + E Specificity ligands
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