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21.The activation of protein kinase A by cyclic AMP binding likely occurs because of:22.Which type of cell-surface receptor undergoes changes in phosphorylation in response to binding of its ligand?1.A protein on a cell surface that binds to a signaling moleculeis an example of which of the following elements of cellular communication?2.Inactivation of a cell-surface receptor depends on:
6.In cell communication, which one of the following is a requirement of the responding cell?-7.Why don’t steroid hormones bind to transmembrane cell-surface receptors?-14.Cell signaling between two nerve cells is an example of paracrine signaling because:18.Which one of the following initiates signal termination?20.What does a ligand-gated channel do?22.What is the end result of activating the MAP kinase pathway?-1.Which type of protein adds a phosphate group to another molecule?5.Which of the following is a cellular response to signal transduction?-18.Many snake venoms contain an acetylcholinesterase inhibitor. Predict what effect the presence of this toxin would have on muscles.-
3.Cyclic AMP is an example of a(n):6.The activation of protein kinase A by cyclic AMP binding likely occurs because of:20. Membrane potential is determined by: