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 attached to the surface of the membrane either by electrostatic interactions or hydrogen bonds with integral membrane proteins, or by covalent bonding with lipid molecules themselves. Transmembrane proteins, integral proteins, integrins, and glycoproteins are all embedded within the hydrophobic portion of the lipid bilayer.