Chapter 23, Problem 34A

Interpretation Introduction

Interpretation:

The name of two types of functional groups that react with each to form peptide bond should be determined along with the name of the functional group in the peptide bond.

Concept introduction:

Proteins are polymeric biomolecules which are formed by the polymerisation of amino acids. Amino acids are the organic molecules with $–{\text{NH}}_{\text{2}}$ and −COOH functional groups bonded on same carbon atom of the molecule.

They polymerise by peptide linkage to form dipeptide, oligopeptide and polypeptide molecules.

Answer to Problem 34A

Two types of functional groups that react with each to form peptide bond is amino group and carboxyl group.

The functional group in the peptide bond is amide group.

Explanation of Solution

Peptide bonds are identified by the bonding present between carboxyl group of one amino acid and one amino group of other amino acid. Each peptide bond formation is a condensation reaction that occurs with the elimination of water molecule.

Thus, two functional groups are amine group and carboxylic acid which react with each other to form peptide bond.

When amine group and carboxylic acid reacts with each other, amide group (peptide bond) is formed with the removal of water molecule.

The general chemical reaction is: