GCSE Biology Unit 2 (15)

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Enzymes and Digestion

  • Digestive enzymes break down big molecules into smaller ones
  • Starch, protein and fats are bigger molecules.
  • They are too big to pass through the walls of the digestive system.
  • Sugars, amino acids, glycerol and fatty acids are smaller molecules.
  • They can pass easily through the walls of the digestive system.
  • The digestive enzymes break down the bigger molecules into the smaller ones.
  • Amylase converts starch into simple sugars
  • Amylase is made in 3 places:
  • 1) The salivary glands
  • 2) The pancreas
  • 3) The small intestine
  • Protease converts proteins


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