Cellulose is .
a.
a component of plasma membranes
b.
a polymer of glucose and fructose
c.
a material found in plant cell walls

d.
the most complex of the organic compounds
e.
a polymer of glucose and galactose

C. A material found in plant cell walls.

Explanation:

Cellulose is an insoluble substance which is the main constituent of plant cell walls and of vegetable fibers such as cotton. It is a polysaccharide consisting of chains of glucose monomers. It is the cell wall of the plants and it provides protection for many  things inside the functioning's of a plant.

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.