Which of the following amino acids is acidic in nature? (a) Lysine (b) Glutamic acid (c) Valine (d) Arginine
Option B.Two amino acids have acidic side chains at neutral pH. These are aspartic acid or aspartate (Asp) and glutamic acid or glutamate (Glu). Their side chains have carboxylic acid groups whose pKa's are low enough to lose protons, becoming negatively charged in the process.
