Now, the sugar molecule contains the hydroxyl groups and that makes it polar. So that means the sugar molecule will interact with the hydrophilic sections of those phospholipids, the heads, and it will point to the aqueous extracellular environment. So the carbohydrate moiety of this glycolipid will interact with the aqueous extracellular environment. Now, let's give an example of the simplest type of glycolipid shown in this diagram. This is known as a cerebral side. So in a cerebral side, the sugar molecule is either glucose or a galactose.