Classify each characteristic as describing glycoproteins or proteoglycans. Glycoproteins Proteoglycans Answer Bank exclusively located at the cell surface and in the extracellular matrix include the heparan sulfate family only has sulfated glycosaminoglycan chains covalently linked to Ser may contain N-linked glycosidic bonds found in Golgi complexes, secretory granules, and lysosomes form highly specific sites for recognition and high-affinity binding by lectins