Why should be the sugar part attached to proteins and lipids on the outer surface of the plasma membrane?
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Cell membranes are selective barriers that separate individual cells and cellular compartments.
Membranes are assemblies of carbohydrates, proteins, and lipids held together by binding forces.
Carbohydrates are covalently linked to proteins (glycoproteins) or lipids (glycolipids) and also an important part of cell membranes, and function as adhesion and address loci for cells.
The Fluid Mosaic Model describes membranes as a fluid lipid bilayer with floating proteins and carbohydrates.
Membrane carbohydrates are chemically bound to glycolipids and glycoproteins.
However, some membrane carbohydrates are part of proteoglycans that insert their amino acid chain among the lipid fatty acids.
Although some carbohydrates can be found associated with intracellular membranes, most of them are located in the outer monolayer of the plasma membrane, facing the extracellular space.