Which of the Following Are Common Means by Which Binding

Which of the following are common means by which binding of an extracellular chemical messenger with a cell's receptor brings about a desired intracellular response?

A) opening or closing of specific channels to regulate ionic movement across the plasma membrane
B) activation of an extracellular second messenger system
C) alteration of DNA structure by attaching to the nucleus
D) combination with surface receptor

Correct Answer:

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