Final answer:
The Davson-Danielli model of the cell membrane is known as the protein-lipid-protein sandwich model. However, it has been replaced by the Fluid Mosaic Model. The Fluid Mosaic Model describes the structure of the cell membrane as a fluid and mosaic-like arrangement of phospholipids, proteins, and other components.
Step-by-step explanation:
The Davson-Danielli model of the cell membrane is known as the protein-lipid-protein sandwich model. Proposed in 1935 by Davson and Danielli, this model suggested that proteins are bound to the polar heads of the phospholipids in the plasma membrane, creating a sandwich-like structure.
However, the Davson-Danielli model was later replaced by the Fluid Mosaic Model, proposed in 1972 by Singer and Nicolson, which better explains the structure and function of the cell membrane. According to the Fluid Mosaic Model, integral membrane proteins are embedded in the phospholipid bilayer, creating a fluid and mosaic-like structure.
The Fluid Mosaic Model has evolved over time and is now widely accepted as the most accurate model of the cell membrane's structure.