All the proteins that are made up of amino acids and sugars or glucose are called glycoproteins. If these proteins contain fructose instead of glucose, they are called mucoproteins and if they contain galactose, they are called galactoproteins. It is soluble in alkali. Cell membranes, jellyfish and saliva contain this protein. Eg- thyroglobin (thyroid), plasma glycoprotein (liver), immunoglobulin (blood cells), ribonuclease (RNA), deoxyribonuclease (DNA), mucin, peptidoglycan (bacteria), ovoalbumin (ovum).