Which of the following amino acids does not have an aromatic substructure within its side chain?

A) tryptophan
B) tyrosine
C) phenylalanine
D) histidine
E) proline

Aromatic Substructure

A part of a molecule containing an aromatic ring, characterized by a ring of atoms with resonance bonds creating stability.

Side Chain

The part of an amino acid that is distinct from the main backbone and determines the amino acid's properties.

Amino Acid

Organic compounds that serve as the building blocks of proteins, containing both an amino group and a carboxylic acid group.