lecture0219final - Bioenergetics Energy used to do work...

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Bioenergetics Energy   - used to do work  Mechanical - movement of cells,  molecules  Electrical - separation of + and -  charges Formation/breaking of chemical bonds  Heat production  Light production
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Energy  - can be stored  Chemical bonds  Electrical potential differences   Chemical concentration gradients.
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Internal Energy First Law of Thermodynamics   Conservation of Energy  Enthalpy  “Heat content”, H  Internal energy, E  H = E + PV Internal energy is stored to some extent  within chemical bonds and so is changed    during a chemical reaction   For a chemical reaction:     H =  E + P V ∆Η= Η( products) - H(reactants)     per mole  For most biological reactions: H =  E
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If internal energy of products is less    than internal energy of reactants     ( H is negative), the difference is given  out as heat or MAY be used to do work.  What is the maximum amount of energy  from the reaction that is available to do  work?
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This note was uploaded on 05/11/2010 for the course BIOLOGY 105 taught by Professor Richard during the Spring '10 term at George Mason.

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lecture0219final - Bioenergetics Energy used to do work...

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