Chapter 14.6, Problem 14.17CE

Interpretation Introduction

Interpretation:

The given tripeptide at low $pH$ and at high $pH$ structures has to be drawn.

Concept Introduction:

• Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.
• Amino functional group is $(-N{H}_2)$ and carboxyl functional group is $(-COOH)$ and a $R$ group is considered as side chain, when all these are bonded to same carbon atom.
• Zwitterion has both positive as well as negative charge, thus it is also called neutral dipolar ion.
• Zwitterion accepts proton in acidic condition and in basic condition zwitterion lose electrons.
• At low $pH$, amine and carboxylic acid are protonated and at high $pH$ amine and carboxylic acid are deprotonated.