Which of These are Not Embedded in the Hydrophobic Portion

Question

Which of these are not embedded in the hydrophobic portion of the lipid bilayer at all?
A) transmembrane proteins
B) integral proteins
C) peripheral proteins
D) integrins
E) glycoproteins

Accepted Answer

Peripheral proteins are not embedded in the hydrophobic portion of the lipid bilayer at all. They are instead bound to the surface of the membrane through non-covalent interactions with integral proteins or lipid molecules. The other choices, transmembrane proteins, integral proteins, integrins, and glycoproteins, are all embedded in the hydrophobic portion of the lipid bilayer to varying extents.