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Glycoproteinsare proteins that have been modified with carbohydrates (sugars), which are attached to theproteinsvia covalent bonds. They are found exclusively at the cell surface and in the extracellular matrix. They may containN-linked glycosidicbonds and form highly specific sites for recognition and high-affinity binding by lectins.Proteoglycans:Proteoglycansare proteins that have been modified withglycosaminoglycans(GAGs), which are long polysaccharide chains that are covalently linked to serine residues of the protein. They are found in Golgi complexes, secretory granules, and lysosomes and include the heparan sulfate family. They consist of sulfatedGAGs, which form highly specific sites for recognition and high-affinity binding by lectins.Learn more aboutGlycoproteins:brainly.com/question/28296641#SPJ4...