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.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy