Describe the structures of amylose, glycogen, and cellulose.

Here are the descriptions of the structures of amylose, glycogen, and cellulose:

i) Amylose:
Amylose is a component of starch and is a linear polysaccharide composed of D-glucose units linked by $\alpha(1 \to 4)$ glycosidic bonds. It typically forms a helical structure in solution. It is unbranched and serves as a storage carbohydrate in plants.

ii) Glycogen:
Glycogen is the primary storage polysaccharide in animals and fungi. It is a highly branched polymer of D-glucose units. The glucose units are linked by $\alpha(1 \to 4)$ glycosidic bonds in the main chain, with $\alpha(1 \to 6)$ glycosidic bonds forming branches approximately every 8-12 glucose units. Its highly branched structure allows for rapid glucose release.

iii) Cellulose:
Cellulose is a major structural component of plant cell walls. It is a linear, unbranched polysaccharide composed of D-glucose units linked by $\beta(1 \to 4)$ glycosidic bonds. The $\beta$-linkages allow cellulose chains to form straight, rigid fibers that can hydrogen bond with adjacent chains, creating strong microfibrils that provide structural support.