Most membrane functions are carried out by proteins. The cell membrane is important because it protects what is inside the cell from outside damage.
phospholipids
proteins
protein
the phospholipids. by weight it is half protein and half lipid
While we are constantly referring to bi-lateral specificity, as in the functions of Dna, here is a case where a virus offers out it's 'hand': it seems likely that it expects to reach for, find and attach to some outstretched Cell Membrane Component.
Most of the active functions of plasma membranes are carried out by proteins.
phospholipids
Phospholipids
proteins
the outer membrane
Cells have methods other than diffusion/osmosis to move materials across the cell membrane, most of which involve membrane proteins and require the use of energy. The cell membrane also performs functions other than controlling the movement of materials into and out of the cell, and the membranes of some specialized cells have very complex functions. So we can see that the cell membrane is a very intricate and important component of the cell.
endo plasmic recticulum
hormones
cell membrane is the most outer part of a cell. cell membrane is very big in surface.
protein
protein
solvent