10.3. Catabolic Processes

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Metabolism

Metabolism = turnover of substances

  • Catabolic processes = breaking down substances
  • Anabolic processes = building up substances
  • Catabolism + anabolism = metabolism

Breaking down the food

Foodstuff Macromolecules Simple molecules

  • Combustion Energy
  • Simple molecules Building blocks for new macromolecules

Overview of the metabolic processes

Most of the metabolic processes take place in the cytoplasm or mitochondrion in the eukaryotic cell.

A typical eukaryotic cell.A typical eukaryotic cell.

An overview of the catabolic processes, and where they take place.An overview of the catabolic processes, and where they take place.In the digistive tract:

  • Carbohydrates glucose
  • Fats fatty acids
  • Proteins amino acids

In the cytoplasm:

  • Glucose pyruvate (glycolysis)
  • Transamination, deamination carboxylic acid + amine

In the mitochondrion:

  • Pyruvate Acetyl-CoA
  • Beta oxidation of fatty acids Acetyl-CoA
  • Citric acid cycle
  • Electron transport chain

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