Final answer:
Glycoproteins are integral membrane proteins that have carbohydrate molecules attached to them, aiding in cell recognition. Selectins are a specific type of glycoprotein that bind to sugar arrangements in oligosaccharides to enable cell-to-cell recognition and adhesion.
Step-by-step explanation:
Glycoproteins are integral membrane proteins that have carbohydrate molecules attached to them, which extend into the extracellular matrix. These carbohydrate tags aid in cell recognition and form the glycocalyx, a fuzzy-appearing coating around the cell. Selectins, which are members of an integral membrane glycoprotein family, bind to specific sugar arrangements in oligosaccharides projecting from the surfaces of other cells, enabling cell-to-cell recognition and adhesion.