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1) The following is the 1-letter sequence of a peptide: YFCAH pKa N-terminus = 9.3, pKa C = 8.3, H = 6.0, and pKa C-terminus

1) The following is the 1-letter sequence of a peptide: YFCAH pKa N-terminus = 9.3, pKa C = 8.3, H = 6.0, and pKa C-terminus = 4.3

a) What is the three-letter sequence of the peptide?

b) Draw the chemical structure of the peptide when it is at pH 7.5. Assign charges and label (circle) the peptide bonds.

c) What is the pI of the peptide?

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