What is the net charge on the dipeptide lys-asp at a $\mathrm{pH}$ of 1.0 ?
Aspartic acid $\left(\mathrm{R}=-\mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{H}\right)$
Lysine ( $\left.\mathrm{R}=\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right)$

Question

Quizplus · Accepted Answer

At a pH of 1.0, both the amino and carboxyl groups at the ends of the dipeptide will be protonated, giving them positive and neutral charges, respectively. The side chain of aspartic acid (Asp) will be protonated and neutral, while the side chain of lysine (Lys) will be protonated, giving it a positive charge. Thus, the net charge is +2.

What Is the Net Charge on the Dipeptide Lys-Asp at A \mathrm{pH}