Which term describes the model of cell membrane structure?

Fluid mosaic model

Explanation:

The structure of the plasma membrane is described by the fluid mosaic model. According to this model plasma membrane of cells is a mosaic of many components like phospholipids, cholesterol, carbohydrates, proteins.

This mosaic nature of the plasma membrane provides fluidity to the plasma membrane. This fluidity is important because it helps in the transport of molecules across the membrane.  

Fluid nature helps transport protein to move and facilitate the passage of molecules in and out of the cell. Therefore the correct answer is the fluid mosaic model.

density and pressure