Cell Suface Receptors have all the following variable characteristics except which of the following. When bound to ligan

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Cell Suface Receptors have all the following variable characteristics except which of the following.
When bound to ligand they couple protein signals for nucleotide hydolysis.
Upon subunit dimerization they signal for autophosphorylation of lysine amino acids.
They can allow ions to move through the cell membrane.
Ligand binding can inititiate dimerization.