Final answer:
The a)fluid mosaic model best describes the structure of a cell membrane, indicating a dynamic, flexible arrangement of phospholipids, proteins, and other molecules within a fluid bilayer.
Step-by-step explanation:
The structure of a cell membrane is best described by the fluid mosaic model. This model depicts the plasma membrane as a mosaic of components.
That include phospholipids, cholesterol, proteins, and carbohydrates, all embedded in a fluid lipid bilayer where these components have the capability to move laterally.
The flexibility of the membrane enables certain enzymes and transport mechanisms to function effectively, while maintaining the integrity of the membrane's selective permeability.