which-structural-feature-differentiates-tryptophan-from-phenylalanine-and-tyrosi

Question

Which structural feature differentiates tryptophan from phenylalanine and tyrosine?

Accepted Answer

Tryptophan has a five-membered ring with a nitrogen atom.

Answer

Tryptophan has a sulfur atom in its side chain.

Answer

Tryptophan has a hydroxyl group attached to the benzene ring.

Answer

Tryptophan has an additional methyl group.