Eight - Bioenergetics

Eight- - Bioenergetics Energy Transformations A Fundamental Property of Living Organisms MCB 2000 Lecture 9 Chemical reactions raise 2 basic

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2/13/12 MCB 2000 Lecture 9 Energy Transformations A Fundamental Property of Living Organisms Bioenergetics
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2/13/12 MCB 2000 Lecture 9 Chemical reactions raise 2 basic questions: • What will happen, i.e., what direction will the reaction proceed? • How fast will the reaction occur? ATP + H 2 O ADP + P i + H + ?
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2/13/12 MCB 2000 Lecture 9 Lecture Outline • Thermodynamics: Introduction to Catalysis Gibbs free energy (G) What does it define? What is dependent on? How does it predict the direction of a reaction? The relationship between G and K eq Coupled reactions--relevance to metabolism
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2/13/12 MCB 2000 Lecture 9 The First Law The Total Energy of a System is Conserved E is the internal energy --- a function that keeps track of heat transfer and work expenditure in the system: E = q + w q is heat absorbed BY the system w is work done ON the system
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2/13/12 MCB 2000 Lecture 9 The Second Law Systems Tend Toward Disorder and Randomness • Systems tend to proceed from ordered to disordered states • All processes proceed toward equilibrium - i.e., minimum potential energy
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2/13/12 MCB 2000 Lecture 9 Important question in thermodynamics Is the process favorable????
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2/13/12 What do we mean by ‘is the process favorable?’ Unfavorable reactions require an input of energy and decrease entropy (Endergonic) Fig. 1-22, p.27 Favorable reactions are those that release energy Favorable reactions are those that increase entropy Exergonic MCB 2000 Lecture 9
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2/13/12 MCB 2000 Lecture 9
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This note was uploaded on 03/19/2012 for the course BIO 2000 taught by Professor Ewr during the Spring '12 term at Alabama.

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Eight- - Bioenergetics Energy Transformations A Fundamental Property of Living Organisms MCB 2000 Lecture 9 Chemical reactions raise 2 basic

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