Proteoglycans are part of the extracellular matrix; they provide structure, viscosity and lubrication, and adhesiveness. they are composed of proteins conjugated to carbohydrate components called glycosaminoglycans. the glycosaminoglycan component makes up the majority of the mass of a proteoglycan. which of the following are possible components of glycosaminoglycans? select all that apply. beta-d-fructofuranose amylose uronic acid n- acetylglucosamine determine which of the following statements about glycosaminoglycans are true. there is more than one true statement; select all the true statements. cellulose is an example of a glycosaminoglycan. glycosaminoglycans are homopolysaccharides composed of repeating glucosamine or galactosamine residues. because glycosanminoglycans consist of only two residues, they generally have low molecular weights. chondroitin sulfate and heparin are examples of glycosaminoglycans. glycosaminoglycans contain a high negative charge density, which enables interaction with the aqueous environment