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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.
You are made up of trillions and trillions of cells, and each one is separated. from its surroundings by a cell membrane. Learn about the structure and functions of the cell membrane in this lesson. 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.