Metabolic Pathways


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•  Metabolic pathways consist of chains and cycles of enzyme-catalysed reactions

Metabolism describes the sum total of all reactions that occur within an organism in order to maintain life

  • Most chemical changes in a cell result from a series of reactions (pathways), with each step controlled by a specific enzyme
  • Metabolic pathways allow for a greater level of regulation, as the chemical change is controlled by numerous intermediates

Metabolic pathways are typically organised into chains or cycles of enzyme-catalysed reactions

  • Examples of chains:  Glycolysis (in cell respiration), coagulation cascade (in blood clotting)
  • Examples of cycles:  Krebs cycle (in cell respiration), Calvin cycle (in photosynthesis)

Types of Metabolic Pathways

metabolic pathways