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The Cell Membrane is a Fluid Mosaic. A cell is the basic unit of life, and all organisms are made up of one or many cells. One of the things that all cells have in common is a cell membrane. It is a barrier that separates a cell from its surrounding environment. This outer boundary of the cell is also called the plasma membrane.
Remember these key points: 1  Cell membranes or plasma membranes consist of a phospholipid bilayer with proteins embedded in the membrane. 2  Most of the functions of plasma membranes are handled by the proteins. 3  This arrangement of proteins and phospholipids is often called the fluid mosaic model for a cell membrane.his idea is called the fluid mosaic model of the cell membrane. Cell membranes are fluid in the sense that the molecules in the membrane are in constant motion. The mosaic part refers to the proteins embedded in the phospholipids.