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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.
The lipid bilayer, therefore, is not a continuous layer, but contains non-lipid molecules, in particular proteins. The significance of the model The fluid mosaic model is the only accepted proper description of a biological membrane.Its publication in 1972 by Singer and Nicolson (Science 1972 Feb. 18 175:23 720-31) put an end to other existing and competing models of biological membranes.he functional characterization of ion channels in biological membranes has proven the fluid mosaic model correct. The model has become a scientific fact. It has become a fact, even though nobody has ever observed the activity of Gramicidin at this single molecule level in a real cell, a bacterial membrane.