Question

Select the correct statement regarding the cell membrane from the following

• A. $Na^{+}$ and $K^{+}$ ions move across cell membrane without carrier proteins
• B. Proteins make up 60 to 70\% of the cell membrane
• C. Lipids are arranged in a bilayered cell membrane with polar heads towards the inner part
• D. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Hint:

Singer and Nicolson’s model highlights the flexibility and protein distribution in membranes.

Answer 1

The Correct Option is D

The fluid mosaic model, proposed by Singer and Nicolson, describes the cell membrane as a dynamic structure composed of a phospholipid bilayer with proteins embedded in it. The lipid bilayer has hydrophilic heads outward, not inward. $Na^{+}$ and $K^{+}$ ions require carrier proteins for transport.