AP BIOLOGY

Detailed explanation-1: -The fluid mosaic model of the plasma membrane was given by Singer and Nicolson in 1972. According to this model, the plasma membrane is made of a phospholipid bilayer with cholesterol, protein, and carbohydrate molecules embedded in it. This membrane is 5-10nm in thickness.

Detailed explanation-2: -The fluid mosaic model describes the cell membrane as a tapestry of several types of molecules (phospholipids, cholesterols, and proteins) that are constantly moving.

Detailed explanation-3: -Cell membranes are represented according to a fluid-mosaic model, due to the fact that they are: Fluid – the phospholipid bilayer is viscous and individual phospholipids can move position. Mosaic – the phospholipid bilayer is embedded with proteins, resulting in a mosaic of components.

Detailed explanation-4: -1) Phospholipids There are two important parts of a phospholipid: the head and the two tails. The head is a phosphate molecule that is attracted to water (hydrophilic).

Detailed explanation-5: -Biological membranes consist of a continuous double layer of lipid molecules in which membrane proteins are embedded. This lipid bilayer is fluid, with individual lipid molecules able to diffuse rapidly within their own monolayer. The membrane lipid molecules are amphipathic. The most numerous are the phospholipids.