The outside structure of the prokaryotic cell has a cell membrane, a cilia and a flagellum.
Cell membrane forms a protective barrier between the exterior environment and the interior of the cell.
Cell
membranes contain membrane proteins that allows all the interaction
that occurs within the cell. It makes the cell membrane selectively
permeable because of its characteristics as being fluid or its fluidity
which means to say that they can move freely within the lipid bilayer.
The membrane proteins can also be stored in the lipid bilayer together
with the enzymes. It cannot be denied that membrane proteins have a lot
of functions based on its type. They can be integral proteins,
peripheral proteins and lipid bound proteins.