![]() In addition to cellular transport, cell membrane functions include recognition, adhesion, and signaling of cells. Hence, it is simply referred to as a semipermeable membrane. With reference to the model, the structure of this biological membrane is such that it only allows entry and exit of certain substances. It serves as a barrier between the cell interior and its surrounding. The plasma membrane is a unique component of both plant and animal cells. According to it, the cell membrane contains different types of protein and carbohydrate molecules embedded in a phospholipid bilayer. ![]() But, none of them are as acceptable as the fluid mosaic model. Besides this hypothesis, several theories pertaining to the plasma membrane structure have been developed. The model explains the structural components of biological membranes. In order to explain the structure and functions of biological membranes, the fluid mosaic model was proposed in 1972 by the researchers, S.J. ![]() This membrane not only serves as a protective covering for the cellular components, but also is a crucial structure for transportation of nutrients and communication between the cells. It holds true for both simple prokaryotic, as well as for the complex eukaryotic cells. The protoplasm of every living cell is enclosed by a plasma membrane.
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