4 stages of aerobic respiration; 1) GLYCOLYSIS.

the first of the 4 stages of aerobic respiration

GLYCOLYSIS - splitting of 6 carbon glucose molecule into 2 molecules of 3-carbon pyruvate.

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GLYCOLYSIS (FIRST STAGE OF AEROBIC RESPIRATION)

GLYCOLYSIS ( 4 stages)

STAGE 1 - ACTIVATION OF GLUCOSE BY PHOSPHORYLATION

  • takes place in cytoplasm of cells
  • begins with activation of main respiratory substrate (mainly hexose sugar - glucose)
  • activation involves addition of 2 phosphate molecules provided by 2 molecules of ATP.
  • the phosphate molecules come from HYDROLYSIS of 2 ATP molecules to ADP ------> this provides energy to activate glucose.
  • the resultant activated molecule is known as PHOSPHORYLATED GLUCOSE
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2ND STAGE OF GLYCOLYSIS

STAGE 2 - SPLITTING OF THE PHOSPHORYLATED GLUCOSE

  • the phosphorylated glucose is split into 2 molecules called TRIOSE PHOSPHATE.
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3RD STAGE OF GLYCOLYSIS.

STAGE 3 - OXIDATION OF TRIOSE PHOSPHATE

  • hydrogen is removed from both of the triose phosphate molecules and transferred to a hydrogen - carrier molecule known as NAD.
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4TH STAGE OF GLYCOLYSIS

STAGE 4 - THE PRODUCTION OF ATP

  • enzyme controlled reactions convert each triose phosphate molecule into 2, 3-carbon molecules called PYRUVATE.
  • in the process, 2 molecules of ATP are regenerated from ADP.
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