LEC 07 Enzyme action - CA TALYSIS OF BIOCHEMICAL REACTIONS...

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CATALYSIS OF BIOCHEMICAL REACTIONS Proteins control the metabolism of a cell by catalyzing specific chemical reactions
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Energetics of a typical chemical reaction Model reaction: A and B can be transformed into C and D by rearranging electrons, thus covalent bonds, upon collision. A + B ------> C + D (reactants, substrates) (products) 1. A and B together have some potential energy (in chemical bonds) and kinetic energy (in motion). 2. A and B collide; collision distorts or stresses bonds to the point where they can rearrange electrons; generally, this requires more potential energy (since without stress, one expects electrons to find low energy, stable state): extra energy is “activation energy”. 3.Complex decays to give different (or same) products.
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What is wrong with this figure (Fig. 6.8)?
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Rates of uncatalyzed reactions: Rate depends on probabilities of: ! Collision ! Orientation ! Energy ! Rearrangement Rate will be slow for most uncatalyzed reactions, because: ! Concentrations are low ! Temperature is low
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This note was uploaded on 07/08/2010 for the course BIS B16 taught by Professor Gerhart during the Winter '10 term at The University of British Columbia.

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LEC 07 Enzyme action - CA TALYSIS OF BIOCHEMICAL REACTIONS...

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