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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.
They are vacuoles, lysosomes, transport vesicles, and secretory vesicles. Vacuoles are vesicles that contain mostly water. They are able to regulate the pressure and water level of the cell to control the conditions of the internal environment. Plant cells are known to have large vacuoles.