Draw a section of the polymer chain of $P$ containing two repeat units.
Put one tick in the table to describe polymer $P$ and the method of polymerisation it undergoes.
State whether polymer $P$ is biodegradable or not, and give a reason for your answer.
State a suitable reagent to make benzene-1,4-dioyl chloride from benzene-1,4-dicarboxylic acid.
Benzene-1,3-diamine is prepared from benzene by the reaction sequence shown. State the reagents used in steps 1 and 3.
Describe the meaning of each of the following terms: primary structure, secondary structure, tertiary structure.
Name the forces or bonds that keep together the primary structure of a protein molecule.
Name the forces or bonds that stabilise the secondary structure of a protein molecule, and identify the groups of atoms in the protein molecule that are held together by these forces or bonds.