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The correct answer is: **a) Glucose is not used to give structure to plants' cell walls while cellulose is.**
Cellulose is a complex carbohydrate (polysaccharide) made up of long chains of glucose molecules, and it provides structural support to plant cell walls. In contrast, glucose is a simple sugar (monosaccharide) that serves as an energy source for cells but does not provide structural function in plant cell walls.