Coenzymes involved in respiration

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  • Coenzymes in respiration
    • Why are they needed?
      • Needed to help enzymes carry out oxidation reactions in respiration.
    • NAD:
      • An organic, non-protein molecule that helps to DEHYDROGENASE ENZYMES.
      • Made of 2 linked nucleotides. When an NAD molecule has accepted 2 HYDROGEN atoms with their electrons, it is REDUCED.
      • When it LOSES its electrons, it is OXIDISED. NAD operates during GLYCOLYSIS, the LINK REACTION, the KREBS CYCLE and during the anaerobic ethanol + lactate pathways.
    • COENZYME A (CoA):
      • Function is to carry ETHANOATE (ACETATE) groups, made from PYRUVATE during the LINK REACTION to the KREBS CYCLE.
      • Can also carry acetate groups that have been made from FATTY ACIDS or from some AMINO ACIDS onto the KREBS CYCLE.


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