These are the base of the cell membrane. Without them, there would be no cell membrane. Other molecules make it easier for transport or just modify the cell membrane (give properties).
These proteins are anchored into the cell membrane. Thus, they must have at least one hydrophobic region.
These are a type of integral protein that extends from one side of the membrane to the other. These are what most integral proteins are. They have a hydrophobic and hydrophilic region.
They are usually an alpha helix.
These proteins are found on the surfaces of the membrane. Thus, they are loosely attached and do not have hydrophobic regions.
They can be attached to phospholipids or integral proteins.
They serve as the identity of each cell and allow cells to recognize each other. Due to this, immune system will not attack them.
Always on extracellular side.
carbohydrates attached to proteins
carbohydrates attached to phospholipids