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Chapter 3 - reaction with a negative change in G-The change...

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Chapter 3: pages 81-115 -Catabolism: Breaks down foodstuff into smaller molecules thereby generating both a useful form of energy and small molecules that the cell needs for building blocks -Anabolism: Uses energy harnessed by catabolism to drive the synthesis of the many molecules that form the cell. -Second law of thermodynamics: The degree of disorder can only increase -Entropy: Measure of disorder -Photosynthesis: -Stage one: light dependent -Stage two: Carbon fixation -Oxidation: the addition of oxygen (the removal of electrons) -Reduction: The addition of electrons -Enzymes lower the energy barriers that prevent chemical reactions from occurring -Each enzyme binds to one or two molecules called substrates -Free energy (G) -A reaction can only occur spontaneously if the change in G is negative -Energetically unfavorable reactions can only take place if they are coupled to a second
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Unformatted text preview: reaction with a negative change in G-The change in G not only depends on the energy stored in each molecule, but also in the concentration of the molecules in the reaction mixture.-Cells exist in state of chemical disequilibrium-Equilibrium constant (K) = [x]/[y]: is directly proportional to the standard free energy change of the reaction-K indicated the strength of molecular interactions: Larger K, the stronger the binding energy, the energy released in the binding interaction (Greater the drop in free energy) -For sequential reactions, the changes in free energy are additive Vm= rate of reaction Km= substrate concentration-Activated carries: Store energy in an easily exchangeable form-ATP is synthesized in an energetically unfavorable phosphorylation reaction...
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