In 1972, scientists Singer and Nicholson proposed the widely accepted fluid-mosaic model of cell membrane structure. It is also called iceberg or iceberg model.
Cell membranes contain five types of phospholipids. Lecithin, cephalin, glycolipid, glycophosphotide and phosphotidic acid. Phospholipids are arranged in two layers. Each lipid molecule has two parts. head and tail Lipid molecules are always moving, shaking and bouncing around each other. This type of movement is called flip flop movement. Flip flop movement causes the cell membrane to behave like a liquid when the layers change.
There are three types of proteins in the cell membrane. Peripheral proteins, intrinsic proteins and intermembrane proteins. At the edges of the lipid layer are the peripheral proteins, the intrinsic proteins are embedded inside, and the intermembrane proteins span from one end to the other. Proteins take energy from ATP to change their conformation.
Protein molecules are scattered between phospholipids in the cell membrane. Because of this, the protein molecules look like a mosaic when viewed from the surface of the cell membrane. To explain this situation in one word, the cell membrane model is called fluid mosaic model. Hence, the fluid mosaic model nomenclature has been meaningful and accurate.