Chapter 24, Problem 107A

Interpretation Introduction

Interpretation: The formation of a dipeptide from two amino acids needs to be written using structural formulas and mention the functional group so formed with this reaction.

Concept introduction: Amino acids are the smaller molecules that make up a protein. The molecules of amino acids are composed of carbon, nitrogen, hydrogen, and oxygen. Different amino acids are beneficial in serving the structural units of all proteins.

An amino acid is a compound that consists of two functional groups that are amino group and carboxyl group along with hydrogen and a side group. All these groups are bonded covalently to each other.

Answer to Problem 107A

When two amino acids are joined together, they form a dipeptide.

The chemical reaction is depicted as follows:

  

The functional group that is formed by this reaction is an amide.

Explanation of Solution

A compound that is formed when two amino acids are joined together is known as a dipeptide.

The bond between two amino acids leads to the formation of an amide bond which is also interpreted as a peptide bond, where the $-\text{COOH}$ of the one amino acid is bonded to the $-{\text{NH}}_{\text{2}}$ of the other amino acid.

The reaction for the formation of a dipeptide is depicted as follows:

  

Thus, the functional group that is formed when two amino acids are joined together is an amide group.

Conclusion

When two amino acids are joined together, they form a dipeptide and the functional group that is formed by this reaction is an amide.