試題詳解

39. Protein X contains 7 transmembrane domains, with a short N-terminus and a long C-terminus. Following protein synthesis, the N-terminus of the protein faces the lumen (the inside) of endoplasmic reticulum (ER). After protein X is transported to the cell surface via exocytosis, you would expect the C-terminus of the protein X to be
(A) extracellular.
(B) cytoplasmic.
(C) in the lumen ofER.
(D) in the lipid bilayer of the plasma membrane.