3.) (3 pts) (a) Draw the structure of the peptide KYCPEH showing every bond and atom (including the hydrogens) in the ionic state that would dominate at pH 1. (Don't worry about stereochemistry). (b) (3 pts) Given the pKa of the N-terminal amino group is 9.6 and the pKa of the C-terminal carboxylate group is 3.5, What is the net charge of this peptide at pH 1? pH 7? pH 14? (c) (2 pts) What is the isoelectric point of this peptide?
