The tetrapeptide Ac-cysteine-alanine-glutamine-argin ine has its N-terminus blocked by acetylation. Its C-terminal pKa is 4.30. Its side chain pKas are 8.3 and 12.5. Use this information to answer questions 14-21. Which of the following is this peptide sequence written in single letter abbreviations?
A. Ac-CANR
B. Ac-CAGR
C. Ac-SANR
D. Ac-CANG
E. None of the above
Answers: 3
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The tetrapeptide Ac-cysteine-alanine-glutamine-argin ine has its N-terminus blocked by acetylation....
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