Aerobic Respiration

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4 Main stages of aerobic respiration:

  • Glycolysis
  • Link Reaction
  • Krebs Cycles
  • Electron Transport Chain


Takes place in the cytoplasm of the cell

  • Glucose (6 carbon) is converted into phosphorylated glucose as ATP molecules give up their phosphate molecules
  • Each phosphorylated glucose (6carbon) molecue is split into 2 molecules of triose phosphate TP (each 3 Carbon) 
  • Each molecule of triose phosphate is converted into pyruvate (3 carbon). In this process 2 molecules of NAD become reduced and 4 molecules of ATP are produced 

Products :

- 2 Reduced NAD

- 4 ATP are made but 2 are used so there is a net gain of 2 ATP

- 2 Pyruvate molecules 

Link Reaction

Pyruvate molecules are actively transported into the matrix of the mitochondria. This is where the link reaction takes place

  • Pyruvate is oxidised by removing hydorgen which is accepted by an NAD molecule causing it to become reduced
  • A molecule of CO2 is produced
  • The 2 carbon molecule that is left combines


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