Anaerobic Respiration of Mammals and Yeast

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Anaerobic Respiration of Mammals and Yeast...

What happens if there is no oxygen?

  • Oxygen acts as final electron acceptor in oxidative phosphorylation
  • If oxygen isn't present, electron transport chain can't function and neither can Kreb's Cycle or the link reaction
  • The only respiration left to occur is the anaerobic part of glycolysis as a source of ATP
  • The reduced NAD generated during the oxidation of glucose, has to be reoxidised so glycolysis can still happen
  • Eukaryotic cells have two pathways for anaerobic respiration to take place -
    • Fungi (e.g. yeast) use ethanol fermentation
    • Eukaryotes use lactate fermentation
  • Neither of these pathways produce ATP, but two molecules of ATP are made per every glucose molecule by substate-level phosphorylation during glycolysis
  • Glycolysis produces two molecules of ATP, two molecules of reduced NAD, and two molecules of pyruvate per one glucose molecule

What happens if there is no oxygen?

  • Oxygen acts as final electron acceptor in oxidative phosphorylation
  • If oxygen isn't present the electron transport chain can't function, and Kreb's cycle and the link reaction also stop
  • This just leaves the anaerobic process of glycolysis as a source of ATP
  • The reduced NAD generated by the oxidation of glucose has to be reoxidised so glycolysis can keep happening
  • Eukaryotic cells have two different pathways of anaerobic respiration - 
    • Fungi (e.g. yeast cells) use ethanol fermentation
    • Eukaryotic cells use lactate fermentation
  • Neither of these pathways produce ATP, but two ATP molecules are made for every one glucose molecule due to substrate-phosphorylation during glycolysis
  • Glycolysis produces two molecules of ATP, two molecules of reduced NAD and two molecules of pyruvate per every one glucose molecule

What happens if there…

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