(a)[3]
Describe three visible ways, shown in Fig. 2.1, in which the glycogen molecule is different from the cellulose molecule.
(b)[3]
Glycogen occurs as granules in mammalian liver and muscle cells. Fig. 2.2 shows a diagram of part of a glycogen molecule taken from a glycogen granule. Explain how the structure of glycogen is linked to its function in cells.
(c)[3]
Explain how the arrangement of cellulose molecules in plant cell walls is linked to their function.