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