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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 cell cycle is regulated by proteins that are outside the cell as well as inside. These proteins are either known as external regulators or internal regulators, based on their functions. The internal regulators are proteins in the cytoplasm and tell the cell when to divide.