Serpentine receptor is a:: (A) Three pass transmembrane protein, (B) Five pass transmembrane protein, (C) Seven pass transmembrane protein, (D) Nine pass transmembrane protein
Answer is C. Serpentine Receptors are G protein coupled receptors that span the cell membrane seven times (seven pass transmembrane protein). Ref: Ganong's Review of Medical Physiology, 21st Edition, Page 42