lecture 8 -e and enzyme functions

lecture 8 -e and enzyme functions - Objectives Review bonds,

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Objectives Explain what enzymes are and what they do Describe how enzyme activity is affected Describe how enzyme action is regulated
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VII. Energy and Enzymes A. Energy Revisited (see Ch. 2) 1. Bonds Nonpolar covalent bonds – electrons are equally shared between two molecules Polar covalent bonds – asymmetrical sharing of electrons between molecules electronegativity = measure of atoms ability to attract e - from bonded atom
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A. Energy Revisited 2. Gibbs Free Energy (∆G) -measure of portion of systems E than can do work (@ constant temp & pressure) OR -measure of change in PE and entropy -to calculate ∆G need to look at properties of system ∆G = ∆ H – T∆S where H = diff in PE, T = temp, S = entropy
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B. E and Metabolic Reactions (rxn) Spontaneous reactions in the cell occur very slowly on their own 1. Why not faster? -few random collisions in correct positions -molecules have to overcome repulsion of electrons -have enough KE to reach unstable in transition state (reach activation E) AB + CD AC + BD need to break bonds, then form new bonds
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B. E and Metabolic Reactions
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This note was uploaded on 11/20/2011 for the course BIOLOGY 101 taught by Professor Freeman during the Spring '11 term at Gustavus Adolphus College.

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lecture 8 -e and enzyme functions - Objectives Review bonds,

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