Proteins

• Amino acids are the monomers of proteins

  they have an R group, this is the variable group

  amino group - NH2

  carboxyl group- COOH

  the variable group determines the amino acid
• polypeptides are formed by polymerisation of many amino acids

  They are joined by a peptide bond, this is a condensation reaction
• primary structure - order of amino acids in polypeptide chain

  secondary structure - the amino acid sequence cause chain to fold into beta pleated sheet or alpha helix , held by hydrogen bods

  tertiary structure - further folding to form unique 3D shape, ionic, hydrogen and disulphide bonds

  quaternary - more than 1 tertiary structure