Chemistry - Biomolecules Question with Solution | TestHub

Basic amino acids contain an extra amine group or a basic nitrogen-containing group in their side chain.

The naturally occurring basic amino acids are lysine, arginine, and histidine.

Histidine contains an imidazole ring in its side chain, which acts as a base.

Tryptophan, threonine, and phenylalanine are neutral amino acids.

Therefore, histidine is the basic amino acid among the given options.

Answer: Histidine