Many G protein-coupled receptors contain seven transmembrane α-helical domains. If the amino terminus of such a protein is located on the extracellular side of the membrane, where would you expect to find the carboxyl terminus of the protein?
A) at the exterior surface of the plasma membrane B) at the cytosolic surface of the plasma membrane C) covalently bound to the amino end of the protein D) embedded in the phospholipid bilayer of the membrane