Which of the following amino acids has a side chain with a c

Which of the following amino acids has a side chain with a conjugate base form that carries a negative charge? Only one answer is correct.

a) K b) E c) T d) N e) R

Solution

The answer is b) E

E is Glutamic acid

It contains an -amino group ( protonated NH₃⁺ form), an -carboxylic acid group ( deprotonated CO₂ form ), and a side chain carboxylic acid, makes it polar negatively charged (at physiological pH), aliphatic amino acid.