Chapter 23, Problem 41A

Interpretation Introduction

Interpretation:

An example of amino acid that has an aromatic ring in its side chain should be determined.

Concept introduction:

Proteins are polymeric biomolecules which are formed by the polymerisation of amino acids.

They polymerise by peptide linkage to form dipeptide, oligopeptide and polypeptide molecules. Each peptide bond formation is a condensation reaction that occurs with the elimination of water molecule.

Answer to Problem 41A

Phenylalanine is an example of amino acid that has an aromatic ring in its side chain.

Explanation of Solution

Amino acids are the organic molecules with $–{\text{NH}}_{\text{2}}$ and −COOH functional groups bonded on same carbon atom of the molecule.

A cyclic ring structure which contains carbon atoms and hydrogen atoms is known as aromatic ring and the compound which has aromatic ring is known as aromatic compound.

The aromatic amino acid includes aromatic ring in its side chain is phenylalanine.

The structure of phenylalanine is: