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Q.

The Pka values for 3-Ionisable groups x, y, z of glutamic acid are 4.3, 9.7 & 2.2 respectively.

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The isoelectric point for the Aminoacid is

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a

7.0

b

3.25

c

4.95

d

5.95

answer is B.

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Detailed Solution

PI for three ionsable group acidic amino acids
PI=12PKa1+PKa3=12(4.3+2.2)=3.25

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