Question

Leucine is a/an ________ amino acid.

• A. essential
• B. non-essential
• C. aromatic
• D. acidic

Answer 1

The correct option is A

essential

Leucine is among 9 essential amino acids which are not produced by our body.
It is a non-polar aliphatic amino acid which contains an $\alpha$-amino group (which is in the protonated $-N{H}_3^{+}$ form under biological conditions), an $\alpha$-carboxylic acid group (which is in the deprotonated $-CO{O}^{-}$ form under biological conditions), and a side chain isobutyl group.