Bio1A Lecture 6_Metabolism

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Unformatted text preview: ed the ground state. The free energy change that occurs during a reaction under a standard set of conditions (temperature 298 K; 1 atm pressure; 1 M solute concentrations) is denoted ΔG°. ΔG’° is the standard free-energy change at pH 7. (and remember the change in Gibbs free energy relationship: ΔG = ΔH - TΔS) Free Energy, Stability, and Equilibrium •  Free energy is a measure of a system’s instability, its tendency to change to a more stable state •  During a spontaneous change, free energy decreases and the stability of a system increases •  Equilibrium is a state of maximum stability •  A process is spontaneous and can perform work only when it is moving toward equilibrium Enzymes Enzymes (“in yeast”) are the chemical reaction catalysts of biological systems. Most enzymes are proteins, and they often use metal ions or prosthetic groups like vitamins to assist catalysis. Many inherited genetic disorder...
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This note was uploaded on 11/05/2012 for the course BIOLOGY 1A taught by Professor Forte during the Spring '10 term at University of California, Berkeley.

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