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Fluid-mosaic model. 1  Plasma membrane consists of a phospholipid bilayer studded with proteins, polysaccharides, lipids. 2  The lipid bilayer is semipermeable Regulates passage of substances into and out of the cell. H2O and some small, uncharged, molecules (O2, CO2) can pass through.
The membrane of all cells is a bilayer of. phosolipids. The membrane has protein molecules that pass all the way through the. phosolipid bilayer. . These proteins. serve as channels (pores) for small molecules and ions to pass in our out of the cell.