Biochemistry Lecture 2. Bioenergetics “The study of energy transductions in living cells” Biological processes obey the laws of thermodynamics, i.e.:

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Presentation transcript:

Biochemistry Lecture 2

Bioenergetics “The study of energy transductions in living cells” Biological processes obey the laws of thermodynamics, i.e.: –Energy isn’t created or destroyed –Entropy of the system always increases Cell Reactants Products

Thermodynamics

Free Energy in Bioenergetics At equilibrium, ΔG = 0 and Q becomes K eq or Structural differences between products and reactants Concentration differences between products and reactants

Organic Chemistry, revisited

ATP Hydrolysis

Coupled Reactions (and why we need them)

+++RC O OHHOR'RC O O 16.7 kJ/molH 2 O

RC O OH+10.5 kJ/molOPOPOPO O O O O O O Ad RC O O O O OPOPOPO O O O O + +

RC O O O O OP O O O OP kJ/mol HOR' RC O O

RC O O HO RC O OH+ATP +AMP +PP kJ/mol +

Phosphate and ATP

Oxidation and Reduction

Electron Carriers

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