Chapter 16.4, Problem 16.11P

Interpretation Introduction

Interpretation:

Peptide bond in ball and stick model below has to be determined. Also, name of amino acids and name of dipeptide in three-letter abbreviation has to be determined.

Concept Introduction:

Amino acids are the biomolecules that contain an amino group, carboxylic acid group, and an alkyl chain. Beside basic amino acid glycine, all amino acids contain chirality centers. Amino acids can exist in different forms depends on value of $\text{pH}$ of aqueous solution.

Peptides are compounds that consist of amide linkage and formed when carboxylic acid group of one unit of amino acid reacts with amino group of another amino acid. The amide linkage is also therefore known as peptide linkage. Peptide linkage contains two terminals. One is $\text{N-terminal}$ that is $\text{α}$ carbon with free $-{\text{NH}}_3^{+}$. Another is $\text{C-terminal}$ that is $\text{α}$ carbon with free $-{\text{COO}}^{-}$.