Many ion channels are not normally open but must be gated or opened by some event. Which of the following is not a typical means by which ion channels open?
A) Binding of neurotransmitter to external binding site
B) Change in voltage across the membrane
C) Phosphorylation by an intracellular second messenger
D) Enzymatic reactions

Question

Quizplus · Accepted Answer

Enzymatic reactions are not a typical means by which ion channels open. Binding of neurotransmitter to external binding site, change in voltage across the membrane, and phosphorylation by an intracellular second messenger are all common mechanisms for ion channel gating.

Many Ion Channels Are Not Normally Open but Must Be