1.

The structure of a basic amino acid, lysine, is given below: (HOOC-underset(.^(o+)NH_(3))underset(|)(C)H-(CH_(2))_(3)-CH_(2)overset(o+)(N)H_(3))(A) The pK_(a_1),pK_(a_2), and PK_(a_3) of (A), respectively, are: 2.18,8.95, and 10.53. What is the pH at isoelectric points (pI)?

Answer»

`(pK_(a_(1))+pK_(a_(2)))/(2)`
`(pK_(a_(1))+pK_(a_(3)))/(2)`
`(pK_(a_(2))+pK_(a_(3)))/(2)`
`(pK_(a_(1))+pK_(a_(2))+pK_(a_(3)))/(3)`

ANSWER :C


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