The sugars associated with glycoproteins and glycolipids of animal cell membranes is called

Oligosacharrides.

Explanation:

Theses are maromolecules (large chains of repeated monomers). They are formed by the bonding of Carbohydrate (Oligosaccharides) to amino acids side chains, by a covalent bonds through peptides bonds as in Glycoprotein, and through the bonding of Oligosaccharides covalently through glycosidic bonds to the Lipids as in Glycolipids. Nonetheless Glycoprotein is a protein, while Glyco; ipids is a lipid.

Groups of carbohydrates with 2-10 monosaccharides units (simple sugar) are Oligosaccharrides. These monosacchrides units are linked together by the glycosidic bonds (depending on whether the sugar bonds with Oxygen or Nitrogen atoms in the Oligo-molecule).

Based on the number of monosaccharides units in Oligo-molecule; they can be named as diasaccharides which are two monosaccharides joined together by condensation reaction. They are the most abundant form of oligosaccharides,

Example are common sucrose, maltose, lactose etc. Sucrose is the most abundant in plant cells, and the main sweet source of sugarcane. it is formed when two monosacharrides units (glucose and fructose) joined by condensation reaction.

When bonded with other molecules as in glycoproteins and glycolipids they assumed different roles of cell recognition and stability.