Proteins

Everything you need to know about proteins for WJEC AS level

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  • Proteins
    • Amino acid and a carboxyl group
      • All contain Hydrogen, carbon, oxygen and nitrogen
        • Most contain phosphorus and sulphur
    • Secondary structure
      • Hydrogen bonds formed between amino acids
        • Coiled into helix
    • Tertiary structure
      • Further coils into 3D structure
      • Maintained through ionic, disulphide and hydrogen bonds
    • Quaternary structure
      • Final 3D structure when 2 or more polypeptide chains join.
    • Test for proteins
      • Buiret  test
        • Turns violet if present
  • Functions
    • Proteins
      • Amino acid and a carboxyl group
        • All contain Hydrogen, carbon, oxygen and nitrogen
          • Most contain phosphorus and sulphur
      • Secondary structure
        • Hydrogen bonds formed between amino acids
          • Coiled into helix
      • Tertiary structure
        • Further coils into 3D structure
        • Maintained through ionic, disulphide and hydrogen bonds
      • Quaternary structure
        • Final 3D structure when 2 or more polypeptide chains join.
      • Test for proteins
        • Buiret  test
          • Turns violet if present
    • Enzymes
    • Structural

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