Which of the Following Are Common Means by Which Binding

question 39

Multiple Choice

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 intracellular second messenger system.
• C) alteration of protein shape and function as a result of phosphorylation.
• D) only (a) and (b) above.
• E) all of these answers.

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