Biochemistry 3380G Lecture Notes - Lecture 15: Electronegativity, Atp Hydrolysis, Redox
2 Feb 2015
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Topic 10 biological forms of energy and reducing power. Gibbs free energy (g: g determines whether a reaction is energetically favourable or unfavourable, g is affected by, properties of the molecules, reaction conditions. Energetically favourable reaction: products are favoured/spontaneous, net conversion of reactants to products without energy input. Reaction at equilibrium: neither products nor reactants are favoured, forward and reverse reactions occur to the same extent and no net reaction takes place. Energetically unfavourable reaction: reactants are favoured, conversion of reactants to products requires energy input. Reactions may be coupled: an energetically favourable reaction can be used to make an unfavourable reaction proceed, the reactions must be chemically coupled together, a favourable reaction: It is more desirable to convert the energy available in glucose to a form that can be used in small amounts, a little at a time, as needed. Stepwise oxidation: cells store energy from food in carrier molecules, to be spent a little at a time.
