naturally occuring

• amino acids:

  • amino acids contain an amino group and a carboxyl group
  • an example is glycine
  • amino acids can react by condensation polymerisation to produce polypeptides
  • long chain polypeptides are proteins
  • e.g haemoglobin transports oxygen
• DNA:

  • made up of two polymer chains called nucleotides
  • each nucleotides contains a base
• sugar:

  • sugars contain carbon, oxygen, hydrogen
  • sugars can react through polymerisation to form carbohydrate polymers
  • starch - store energy
  • cellulose - found in plant cell walls