A Ligand-Gated Ion Channel (Such as the Nicotinic Acetylcholine Receptor)

question 1

Multiple Choice

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.

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