bioenergetics, thermodynamics

bioenergetics, thermodynamics - !"#$%&"'(')*+","&-".#/'...

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6"4 7+,#"8$/ Thermodynamics applies to biochemistry, too Bioenergetics: Quantitative study of ENERGY TRANSFORMATIONS in biological systems, underpinnings of all of biochemistry F REE ENERGY CHANGE ( ! G) for a reaction quantiFes energy available available to do useful work; related to change in ENTHALPY and change in ENTROPY : ! G = ! H T ! S S TANDARD FREE ENERGY change for a reaction ( ! G°) is change in free energy for going from standard conditions to equilibrium; related to equilibrium constant K eq : ! G ° = – RT ln K eq Actual ! G = ! G ° + ln {actual mass action ratio Q } Sign of ! G indicates direction reaction would have to go to reach equilibrium (the “ SPONTANEOUS ” direction)
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!"5&,*,- 9:;"#.<"/ Explain in conceptual terms: change in free energy ( ! G ); change in enthalpy ( ! H ); change in entropy ( ! S ). Relate ! G to ! H and ! S . Relate the sign of ! G to the direction in which reaction will go to get to equilibrium. Explain the difference between standard free energy change ( ! G °) and actual or physiological free energy change ( ! G ). Given the equilibrium mass action ratio (K eq ), calculate the standard free energy change ( ! G °).
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This note was uploaded on 05/06/2010 for the course BIOC 460 taught by Professor Ziegler during the Spring '07 term at University of Arizona- Tucson.

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bioenergetics, thermodynamics - !"#$%&"'(')*+","&-".#/'...

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