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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.
â¢ Provide examples of molecules that can diffusion through the cell membrane and molecules that cannot diffusion through the membrane. In order for a cell to function effectively, it needs to be able to control which substances can enter and exit through its membrane.