阿摩線上測驗
14. The following are the two pKa values for serine. What is the isoelectric point (pl) of serine? 
(A) 9.15
(B) 6.94
(C) 5.68
(D) 2.21
(E) None of the above
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統計： A(0), B(1), C(23), D(1), E(0) #3227627
統計： A(0), B(1), C(23), D(1), E(0) #3227627
