chegg g protein-coupled receptors contain 7 transmembrane α helices. the helices are connected by loops of amino acids either at the exterior face or the cytosolic face of the membrane. the loop between helices 5 and 6 binds to the g protein. the loop between helices 6 and 7 binds the ligand (hormone) on the same side of the membrane where the n-terminus of the protein is located. where would one expect to find the c-terminus?