campbl06 - Bioenergetics (Overview) Anabolic Catabolic...

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Bioenergetics (Overview) Catabolic Anabolic
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Metabolism (Overview) Metabolism = Catabolism + Anabolism Catabolic reactions are energy yielding They are involved in the building up of simpler molecules into more-complex ones They are involved in the breakdown of more- complex molecules into simpler ones Anabolic reactions are energy requiring
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Energy Coupling in Metabolism Catabolic Reactions provide the energy that drives Anabolic Reactions forward Catabolic reaction Anabolic reaction
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Organisms are Energy Transducers First Law of Thermodynamics: Energy can be neither created nor destroyed Therefore, energy “generated” in any system is energy that has been transformed from one state to another (e.g., chemically stored energy transformed to heat) Second Law of Thermodynamics: Efficiencies of energy transformation never equal 100% Therefore, all processes lose energy , typically as heat, and are not reversible unless the system is open & the lost energy is resupplied from the environment Conversion to heat is the ultimate fate of chemical energy
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Organisms are Energy Transducers
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Organisms are Energy Transducers As energy transducers organisms are <100% efficient (2 nd law) Organisms employ this energy to: Grow Protect Themselves Repair Themselves Compete with other Organisms Make new Organisms (I.e., babies)
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This note was uploaded on 06/03/2011 for the course BIO 113 taught by Professor Swenson during the Spring '08 term at Ohio State.

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campbl06 - Bioenergetics (Overview) Anabolic Catabolic...

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