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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 passage of a cell through the cell cycle is controlled by proteins in the cytoplasm, the cyclins and cyclin dependent kinase, and their levels rise and fall through different stages in the cell cycle.