Which statement about ion channels is true?

Question

Quizplus · Accepted Answer

Ion channels are opened by the binding of ligands or by changes in electric potential across the membrane. This allows ions to pass through the channel, down their concentration gradient, without the need for energy input (such as ATP). Ion channels can be either open or closed, but they are typically closed most of the time and only open in response to a stimulus. The rate of transport through ion channels is very fast, often exceeding the rate of transport through carrier proteins.

Which Statement About Ion Channels Is True