9/17/20111Energetics & MetabolismDr. Mark HolbrookEnergetics and Metabolism•Energy•Chemical reactions•Open versus closed systems•Energy couplingMetabolism•= The totality ofchemical reactions inan organism•Metabolism can beconsidered as a web ofinterconnectingenergy transformations
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9/17/20112Energy Flow and Chemical RecyclingEnergy in ATP comes ultimately from light energy9.2and cyanobacteriaEnergetics and MetabolismCatabolic pathways+ energyAmino acids polypeptideTranslationEnergy(Degradation)Anabolic pathways+ Light energy(Biosynthesis) Energy –Capacity to cause change •Kinetic energy:motionheat (= transformation of energy due to temperature difference)•Potential energy:gravitationalchemical energy•“Work” = transformation of energy notdue to temperature difference (i.e., heat)•Study of energy transformations = Thermodynamics•“System” = part of universe under study•“Surroundings” = rest of universe