2. Draw a titration curve for histidine. Draw the forms of histidine directly on the graph that would predominate at pH 1, pH 4, pH 7, and pH 14. Net charge of molecules +2 +1.5- +1 +0.5 -0.5 -1.5 T -2 T -1- T T 1 ـ ليا 3 15 7 9 pH of solution 11 13 14

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