Bioenergetics: Biological Oxidation Reduction

Bioenergetics: Biological Oxidation Reduction

January 7, 2022

Bioenergetics: Biological Oxidation Reduction

  • Oxidation-reduction (redox) reactions involve the loss of electrons by one chemical species, which is thereby oxidized, and the gain of electrons by another, which is reduced.
  • The flow of electrons in redox reactions is responsible for all work done by living organisms.
  • Source of electrons:  in non-photosynthetic organisms: reduced compounds (foods)
  • In photosynthetic organisms, the initial electron donor: H2O in the presence sunlight.
  • Electrons move from various metabolic intermediates to specialized electron carriers in enzyme-catalyzed reactions. The carriers in turn donate electrons to acceptors with higher electron affinities, with the release of energy.

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