1. Histidine has the following pKa values: pK₁ = 1.82, pK₂ = 9.17, = 6.0 Give the net charge of histidine at pH = 12
(A) 0
(B) +1
(C) +2
(D) -1

1. 題目解析本題要求計算組氨酸（H...