Activation of a cell-surface receptor by ligand binding can lead to a signal within the cell by .. a) activation of a G-protein associated with the cytosolic side of the plasma membrane. b) opening of an ion channel, allowing diffusion of ions into the cellI. c) causing dimerization of the receptor and activation of enzyme activity on the the cytosolic side of the plasma membrane. O d) either a or c can happen, depending on the ligand and the receptor e) a, b or c can happen, depending on the ligand and the receptor

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