Final answer:
Cellulose is the non-digestible polymer of glucose found in plant cell walls that serves as a structural component and not energy storage. It is indigestible to humans and contributes to dietary fiber.
Step-by-step explanation:
The non-digestible polymer of glucose that serves as the storage form of carbohydrates found in the cell wall structure of plants is cellulose. Cellulose is a linear polymer made up of glucose monomers and is the main structural component of plant cell walls. It is considered the most abundant natural biopolymer and provides structural support to the cell.
Although it is comprised of glucose, the way the molecules are linked (β-1,4 glycosidic bonds) makes it indigestible to humans. Instead, it contributes to dietary fiber, which is important for human health. On the other hand, the other mentioned polymer, chitin, is also a polysaccharide but differs in structure and composition as it includes N-acetylglucosamine units and is found in the cell walls of fungi and the exoskeletons of arthropods.