Which amino acid has an imidazole ring in its side chain?

A) tyrosine
B) tryptophan
C) isoleucine
D) asparagine
E) histidine

Imidazole Ring

A heterocyclic compound containing a ring made of three carbon atoms and two nitrogen atoms, found in many biologically important molecules.

Side Chain

A group of atoms attached to the main part of a molecule and having a composition and structure independent of the molecule's primary structure.

Amino Acid

Organic compounds containing an amine (-NH2) and a carboxyl (-COOH) functional group, along with a side chain; they are the building blocks of proteins.