Determine which statements about glycosaminoglycans are true. Hyaluronan (hyaluronate) and heparin are examples of glycosaminoglycans. Glycosaminoglycans are heteropolysaccharides composed of repeating disaccharide units. Cellulose is an example of a glycosaminoglycan. The amino groups of the amino sugar derivatives provide a positive charge that offsets the negative charges from the sulfate or carboxylate groups. Because glycosaminoglycans consist of only two residues, they generally have low molecular weights