# Biochemistry

###### Question:

The tripeptide alanyllysylaspartate contains four ionizable groups with pKas of 2.0, 3.9, 9.9, and 10.5. Calculate the pI for this molecule.
a)3
b)6
c)6.2
d)10.2
e)none of the above.
The ans is none of the above. can you explain?

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