The structure of a cell plasma membrane, with its oily nature and embedded proteins, is described as the fluid mosaic model.

Here's why:

* Fluid: The phospholipid bilayer, the foundation of the membrane, is fluid. The phospholipids can move laterally within the membrane, giving it flexibility.

* Mosaic: The membrane is a mosaic because it contains a variety of different components, including phospholipids, cholesterol, proteins, and carbohydrates. These components are arranged in a complex pattern, like tiles in a mosaic.

So, the fluid mosaic model accurately reflects the dynamic and complex nature of the cell membrane.