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11.What does a Tyrosine-kinase receptor do once it is activated?12.What is a ligand-gated ion channel?13.Are all receptors located on the cell membrane? Explain your answer and if no, indicte which molecules may interact with these non-membrane receptors.14.When testosterone binds to a receptor in the cytoplasm the complex goes into thenucleus of the cell and turns on _____genes______________.
15.What action is a widespread mechanism for regulating protein activity?