How do you solve this. Please explain why it is C instead of D. if its in 3rd ca

Question

How do you solve this. Please explain why it is C instead of D. if its in 3rd carbon it would be 10.7+4.3/2

4. You discover an unusual species of bacteria, Bacillus studyatusfillus. This bacterium contains an unusual amino acid, based on glutamic acid. For this unusual amino acid, a hydrogen atom on the carbon-3 (the -carbon) is replaced with another amino group. What is the isoelectric point (pI) for this unusual amino acid given the list of pKa values below? pKa-COOH = 2.1 pkR-COOH = 4.3 pKa-NH3 = 9.3 pky-NH3= 10.7 B. C. P D. p1 = 3.2 pl=4.3 pl = 6.8 p1 = 7.5 p1 = 9.3

Explanation / Answer

Yes the answer will be option (c) (4.3+9.3)/2 as at 4.3 all the carboxylic group so second pK value will be the acid one first pk value will be base one because in second pk value the both acidic gp will release its ions..

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