It is composed of a linear polymer of D-glucose units connected together by -1,4 glucosidic linkages. It contains two polysaccharides composed of alpha-D-glucose units: amylose - linear with -1,4-glycosidic bonds. Polysaccharides consisting of molecules of more than one sugar or sugar derivative are called heteropolysaccharides (heteroglycans). Glycogen, with its many branchs, is a single molecule. It is a structural polysaccharide present in plants. A review of colligative properties would inform you that if glucose was stored as the monosaccharide, a great osmotic pressure difference would be found between the outside and inside of the cell. Starch is a polysaccharide carbohydrate (C 6 H 10 O 5)n consisting of a large number of glucose monosaccharide units joined together by glycosidic bonds found especially in seeds, bulbs, and tubers. It makes chemical sense to store glucose residues as either glycogen or starch, one large molecule. Cellulose is a polysaccharide consisting of a linear chain of (14) linked D-glucose units: (C 6 H 10 O 5) n. At some point, the active site must get buried and the protein can no longer add more monomers. The dimeric protein glycogenin is an enzyme that autoglucosylates itself in a stepwise fashion. The fibrous tissue in the cell walls of plants contains the polysaccharide cellulose, which consists of long chains of glucose units, each of which is connected by a -glucoside link to the C4 C 4 hydroxyl of another glucose as in the disaccharide cellobiose (i.e. Amylopectin is a branched-chain polysaccharide composed of glucose units linked primarily by -1,4-glycosidic bonds but with occasional -1,6-glycosidic bonds, which are responsible for the branching. \): Glycogen particle with glycogenin at its core
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