Question

The secondary structure of that portion of an integral protein that is buried in the lipid bilayer of a cell membrane is?

• A. Strand
• B. Bend
• C. Random coil
• D. Helix

Answer 1

The correct option is D Helix

Integral or intrinsic proteins have both hydrophobic and hydrophilic parts. The hydrophilic portion of these proteins is found interacting with the heads of the lipid molecule. The hydrophobic portion of such proteins is often found buried in the bilipid molecule. The secondary structure of these hydrophobic portions is usually in the form of alpha helices.

So, the correct answer is 'Helix'.