The Biological and Social Philosophy

 Plasma membrane or cell membranes One of the component of a cell is plasma membrane, it acts like a shield. At the boundary of every cell, the plasma membrane functions as a selective barrier that allows passage of enough oxygen, nutrients and wastes to service the entire cell. In other words a cell membrane is a covering or boundary which bounds the cell and cytoplasm hence, called plasma membrane or cell membrane. Cellular membranes contain four components: (1) a phospholipid bilayer, (2) transmembrane proteins, (3) an internal protein network providing structural support, and (4) cell-surface markers composed of glycoproteins and glycolipids. The fluid mosaic model of membrane structure includes both the fluid nature of the membrane and the mosaic composition of proteins floating in the phospholipid bilayer It maintains cell structure, shape just like fencing around a garden or farm. In plant cell cell wall is another covering upon cell membrane made up of cellulose that'...