Question

In the given structure of plasma membrane made up of two layers of phospholipid molecules, the water molecules will exist in the parts labelled as

• A. I and II
• B. IV and V
• C. I, II and III
• D. III, IV and V
• E. I, II, IV and V

Answer 1

Answer: (A)

I and II

The plasma membrane is made up of phospholipid bilayer which surrounds the cell and separates the cell from the outer environment. The hydrophilic head groups of phospholipids make the polar surface of the membrane and always in contact with the water in and out of the cell represented by the I and II. The hydrophobic tails of phospholipids are represented by IV and together these nonpolar tails make the hydrophobic interior of the membrane.

Therefore, the correct answer is option A.