The overall charge on the residue ( lysine residue ) is ; ( C ) 0 charge
The a-aminium group of lysine amino acid will begin deprotonating by the presence of NaOH as the pH level of the solution increases.
Given that the pKa level of a-aminium group = 9. when the pH of the solution is buffered to 9.0 . half of the a-aminium ions that is present in the lysine amino acid will deprotonate leaving the overall charge on the lysine residue at neutral ( 0 charge ).
Hence we can conclude that the overall charge on the residue is a 0 charge.
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