<prompt> Which of the following glycoprotein has both lubricant and protective action:MucinImmunoglobulinCollagenAlbumin  <response>: Ans. A MucinRef: Harpers Illustrated Biochemistry 31st Ed; Page No- 547Glycoprotein and their FunctionsGlycoproteinsFunctionMucinsLubricant and protective agentImmunoglobulins, histocompatibilityantigensImmunologic moleculeCollagensStructural moleculeCalnexin, calreticulinRegulate folding of proteins that are exported from the cellPlasma proteins of cold-water fishAntifreezeTransferrin, ceruloplasminTransport moleculeLectins, selectin cell adhesion lectins, antibodiesInteract with specific carbohydratesNotch and its analogs, key proteins in developmentRegulation of differentiation and development 