(a(i))[1]
Draw the general structure of the amino acid monomers from which proteins are made.
(a(ii))[1]
Proteins are polyamides. Name one other polyamide.
(b(i))[1]
Name the linkage found in PET.
(b(ii))[2]
Proteins and PET are both produced by condensation polymerisation. Describe how condensation polymerisation and addition polymerisation are different.
(c)[2]
Describe two environmental problems caused by the disposal of plastics such as PET.