Amino Acids MCQs If pK1 = 2.34 and pK2 = 9.60, then the isoelectric point pI is? January 1, 2022 Q. If pK1 = 2.34 and pK2 = 9.60, then the isoelectric point pI is? A. 5.87 B. 5.97 C. 3.67 D. 11.94 Answer: 5.97