Question

An improved model of the structure of cell membrane proposed by Singer and Nicolson (1972), was widely accepted as

• A. Plasma membrane model
• B. Sandwich model
• C. Unit membrane model
• D. Fluid mosaic model

Answer 1

The correct option is D Fluid mosaic model

Fluid mosaic model of the plasma membrane was proposed by the Singer and Nicolson in 1972 and the most widely accepted model. According to this model, there is a double layer of phospholipid molecules with globular protein molecules and sterols which are arranged differently in different parts of the plasma membrane. Some protein molecules penetrate through the lipid layers, others partially penetrate and still, others lie outside the lipid layers. In the plasma membrane of the animal cells, glycolipids and cholesterol are also present.

Thus, the correct answer is option D.