Question

Keeping is view the structure of cell membrane, which one of the following statements is correct with respect to the movements of liquid and proteins from one liquid monolayer to the other (flip flop movement).

• A. While proteins can flip flop, liquids can not
• B. Neither lipids, nor proteins can flip flop
• C. Both lipids and proteins can flip flop
• D. While lipids can rarely flip flop, proteins can not

Answer 1

The correct option is D While lipids can rarely flip flop, proteins can not

• The cell membrane is composed of the lipid bilayer membrane. There are proteins embedded in the layer.
• The structure of the cell membrane is known as a fluid mosaic model. There are phospholipids that can show some amount of flip flop movement. They can migrate from one layer to another layer.
• This type of movement is shown by the lipid molecules. The proteins are fixed in the layer of the cell membrane. They do not show any type of movement.

Thus, the correct answer is option D.