Answer:
The fluid mosaic model is created by many phosopholipids joined together. Additionally proteins with carbohydrates attached lie on the surface. For extra information these proteins are called glycoproteins. The fluid mosaic model is just another qord for the plasma membrane or cellular membrane. It is called so because it IS fluid and from the top looks like a mosaic. So to answer your question they are just used to regulate the inner cell environment and allow substances to enter and exit the cell.