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Cellulose, on the other hand, is the main structural component of plant cell walls. Its glucose units are linked together by beta (1→4) glycosidic bonds. This configuration creates straight chains that can stack closely together, forming strong hydrogen bonds with adjacent chains. The result is a rigid structure that provides plants with tensile strength. The rigidity of cellulose makes it insoluble in water, unlike starch, which can absorb water and slightly swell due to its helical structure.