Q 3

Which of the following are ways in which binding of an intercellular chemical messenger with a cell's receptor can bring about a cellular response? A) opening or closing of specific ionic channels in the plasma membrane B) activation of an intracellular second-messenger system C) promoting or inhibiting the transcription of genes that code for the synthesis of cellular proteins D) activating or inhibiting intracellular enzymes E) All of the choices are correct.

Multiple Choice