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Eduncle Best Answer
Glycosaminoglycans (GAGs) are large linear (UNBRANCHED) (hence statement 2 is incorrect) polysaccharides constructed of repeating disaccharide units with the primary configurations containing an amino sugar (either GlcNAc or GalNAc) and an uronic acid (either glucuronic acid and/or iduronic acid). There are five identified glycosaminoglycan chains : Hyaluronan, Chondroitin, Dermatan, Heparin/heparan, Keratan (Hence Statement 3 is correct). Proteoglycans consist of a core protein and one or more covalently attached glycosaminoglycan chains. Virtually all mammalian cells produce proteoglycans and secrete them into the ECM, insert them into the plasma membrane, or store them in secretory granules. Hence statement 1 is correct. The major components of the ECM are fibrillar proteins that provide tensile strength and elasticity (e.g., various collagens and elastins), adhesive glycoproteins (e.g., fibronectin, laminins, and tenascins), and proteoglycans.
Hence statement 4 is also correct.