<prompt> Which of the following amino acid can have o-Glycoxylation linkage in oligosaccharide molecule:AsparagineGlutamineSerineCysteine  <response>: Ans. C. SerineMajor Classes of Glycoproteins O-linked GlycoproteinO-glycosidic linkage between hydroxyl side chain of serine or threonine and N-acetyl galactosamine is presentN-linked GlycoproteinN-glycosidic linkage between amide nitrogen of asparagine and N-acetyl glucosamine is present.Glycosyl phosphatidylinositol-anchored GPI-anchored, or GPI-linked glycoproteinsThird major class of Glycoproteins.They link several proteins to Plasma membrane.Linked to the carboxyl terminal amino acid of a protein via a phosphoryl-ethanolamine moiety joined to an oligosaccharide glycan, which in turn is linked via glucosamine to phosphatidylinositolPI. 