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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.
What are the special structures in the cell membrane that allow materials such as water and sugar to pass through made of? Biology Movement In and Out of Cells Transport Across the Cell Membranes 1 Answer