[Campbell Biology P.184] Based on the information provided, which of the following statement... | Practice Question

Based on the information provided, which of the following statements about gated ion channels is true?

  • A: All gated ion channels open or close only in response to an electrical stimulus.
  • B: Gated ion channels are a type of carrier protein that changes shape to transport ions.
  • C: The opening or closing of gated ion channels can be triggered by either electrical or chemical stimuli.
  • D: Gated ion channels primarily function to pump ions against their concentration gradient.

Explanation

The text explicitly states: 'Many ion channels function as gated channels, which open or close in response to a stimulus... For some gated channels, the stimulus is electrical... Other gated channels have a chemical stimulus.' This directly supports option C.