Anaerobic respiration

• What stages of aerobic respiration cannot occur in the absence of oxygen ?


  • Krebs cycle
  • Electron transport chain
• Why can’t the Krebs cycle or ETC occur in anaerobic respiration ?


  • No FAD or NAD will be available to take up H+ produced during the Krebs cycle
  • Because all the FAD and NAD will be reduced
  • So, Enzymes stop working
• What is the first stage of anaerobic respiration ?

  Glycolysis
• Where does glycolysis occur ?


  Cytoplasm
• Is glycolysis aerobic or anaerobic ?


  Anaerobic
• What happens to pyruvate in anaerobic respiration ?


  • Fermentation
  • Pyruvate is converted to ethanol or lactate using reduced NAD
  • The oxidised NAD produced in this way can be used in further glycolysis
• How is oxidised NAD, produced by fermentation, used in anaerobic respiration ?


  Further glycolysis