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Lysine is an amino-acid with a basic side chain. The pKa of the acid/base groups is shown on the structure (note: this structure will not exist as shown at any pH).

/in /by

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Lysine is an amino-acid with a basic side chain. The pKa of the acid/base groups is shown on the structure (note: this structure will not exist as shown at any pH).

If lysine is in a solution with a pH = 7, what is the charge on the molecule? Consider what charge an amine group has when protonated and what charge a carboxylic acid group has when deprotonated.

A) -1

B) -2

C) +1

D) 0

E) +2

 
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