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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.
A mosaic is a type of art in which small pieces of glass are arranged to make a larger picture. The same is true for a cell membrane. Although the individual components are small, they form a remarkable barrier when put together. Lesson Summary. A cell membrane is a fluid, flexible barrier on the outside of a cell that protects it. A cell membrane's phospholipids and proteins arranged in a bilayer give it semi-permeability, allowing some molecules into the cell but not all.