Suppose you have a peptide composed of 4 amino acids bonded together: alanine, arginine, asparagine, and the novel amino acid armadillamine, which has an ionizable side group with a pKa of 7.2. At pH 9.5, this peptide has a net charge of -1. What is the charge on the protonated form of the armadillamine side group? Explain how you determined the charge on the protonated armadillamine side group)

Biochemistry
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Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
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 2) Suppose you have a peptide composed of 4 amino acids bonded together: alanine, arginine, asparagine, and the novel amino acid armadillamine, which has an ionizable side group with a pKa of 7.2. At pH 9.5, this peptide has a net charge of -1. What is the charge on the protonated form of the armadillamine side group? Explain how you determined the charge on the protonated armadillamine side group)

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