Proteins

  • describe the structure of an amino acid and the formation and breakage of a peptide bond
  • recall that:
    • Dipeptides are formed by the condensation of two amino acids.
    • Polypeptides are formed by the condensation of many amino acids
  • explain the meaning of the terms primary structure, secondary structure, tertiary structure and quaternary structure of proteins and describe the types of bonding (hydrogen, ionic, disulfide and hydrophobic interactions) that hold these molecules in shape
  • describe the molecular structure of haemoglobin as an example of a globular protein, and of collagen as an example of a fibrous protein and relate these structures to their functions (to include emphasis on the importance of iron in the haemoglobin molecule, and distinction made between collagen molecules and collagen fibres)
  • describe the biuret test for proteins
  • relate the structure of proteins to properties of proteins named throughout the specifcation