43 下列何者是配體管制型離子通道（ligand-gated ion channel）如菸鹼性乙醯膽鹼受體（nicotinic acetylcholine receptor）的特性？
(A)在脂雙層中允許離子通透的帶電脂質
(B)碰到特定的離子時才允許配體通過細胞膜
(C)碰到特定的配體時才允許離子通過細胞膜
(D)配體與細胞膜上相對應受體結合需依賴特定離子存在

ch11-35. A ligand-gated ion channel (such as the nicotinic acetylcholine receptor) is:
A) a charged lipid in the membrane bilayer that allows ions to pass through.
B) a membrane protein that permits a ligand to pass through the membrane only when opened by the appropriate ion.
C) a membrane protein that permits an ion to pass through the membrane only when opened by the appropriate ligand.
D) a molecule that binds to the membrane thereby allowing ions to pass through.
E) always requires a second ligand to close the channel once it is opened.
Ans:C) a membrane protein that permits an ion to pass through the membrane only when opened by the appropriate ligand.