Question

ion channels in cell membranes
multiple choice
are nonspecific
are not affected by differences in electrical potential across the membrane
may open in response to binding a ligand
only allow ions to move from the extracellular fluid into the cell
only allow ions to move from the intracellular fluid out of the cell

Explanation:

Ion channels in cell membranes are specific in the ions they allow to pass through. They can be voltage - gated (affected by electrical potential differences across the membrane), ligand - gated (open in response to binding a ligand), and can allow ions to move in both directions (into or out of the cell).

Answer:

C. may open in response to binding a ligand