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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 action of the hydrolytic enzymes upon the contents of the vacuole digests them, breaking them down into monomers, such as simple sugars and amino acids, that are able to traverse the lysosomal membrane via transport proteins and enter the cytosol, where they serve as cell nutrients.