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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.
1 The cell membrane controls which substances pass into and out of the cell. 2  Carrier proteins in or on the membrane are specific, only allowing a small group of very similar molecules through. 3  For instance, Î±- glucose is able to enter; but Î² â glucose is not.