Answer:
pI of arginine = 10
Explanation:
The isoelectric point, pI for amino acids without ionizable side chains is given by
pI = (pKa of acidic group + pKa of basic groups)/2 (arginine has two basic groups)
The carboxyl group for arginine is blocked off, therefore, pI for arginine,
(pKa + pKa)/2 = (0 + 20)/2 = 10.
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