Cellulose is found throughout the cell walls of plant cells. cellulose makes cell walls rigid, which indicates that cellulose is a carbohydrate. lipid. nucleic acid. protein.

Answer;
Cellulose is found throughout the cell walls of plants cells. It makes cell walls rigid, which indicates that cellulose is a carbohydrate. 

Explanation;
Cellulose is the most abundant compound on earth and an important polysaccharide. It is a major structural component of tough cell walls that surround plant cells, a feature that makes plant cells strong. Unlike animals cells, plants cells contain cellulose cell walls which are strong enough to resist environment pressures, such as high turgidity, osmotic pressure.

The fact that cellulose is found throughout the cell walls of plant cells and is responsible for making these walls fairly rigid points to the fact that cellulose is a carbohydrate.