Chapter 21, Problem 10A

Interpretation Introduction

Interpretation:

The six different tripeptides possible for phenyl alanine, alanine and glycine must be sketched. The terminal amino group and carboxyl group needs to be clearly indicated.

Concept Introduction:

A tripeptide is compound of three amino acids in which there are two peptide bonds.

Answer to Problem 10A

Sketch of six possible tripeptides are given below.

  

Explanation of Solution

Six possible tripeptides are drawn taking all possible combinations of three given amino acids.

Terminal amino groups are shown in red and terminal carboxyl groups are shown in green.

Name of all the tripeptide sequences are written. Three letters abbreviation for glycine, alanine and phenyl alanine are gly, ala and phe respectively.

Conclusion

Six tripeptides are possible for three amino acids when each amino acid can be used once.

Each tripeptide contains two peptide (CONH) bonds.