(a(i))[3]
The diagram in Fig. 2.1 shows two amino acids. Complete the diagram to show how these two amino acids react together to produce a dipeptide.
(a(ii))[2]
State what $R_1$ and $R_2$ represent in Fig. 2.1.
(b)[2]
Using Fig. 2.2, state how a cellulose molecule's structure differs from that of an amylose molecule.
(c)[4]
Cellulose forms the main part of plant cell walls. Explain why cellulose is suitable as a component of plant cell walls.