The current model of plasma membrane structure is fluid-mosaic model. According to fluid-mosaic model, there is a lipid bilayer that gives fluidity to the membrane and in which the protein molecules are embedded. The membrane is mosaic because there is a pattern of different types of molecules that are put together. Molecules are constantly moving in two dimensions.
Components of the cell membrane include:
• Phospholipids – Form a bilayer
• Cholesterol –improves stability and reduce fluidity
• Proteins –integral (transmembrane) or peripheral
• Sugars-usually attached to proteins.