Chapter 18.3, Problem 18.8P

Interpretation Introduction

Interpretation:

Amino acid that is hydrophilic has to be identified and explained.

Concept introduction:

Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.

Amino acid had both amino functional group and carboxyl functional group in a molecule.

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.

The amino acids that are neutral are further classified into polar and non-polar.

The side chain are classified into hydrophobic (water hating) and hydrophilic (water loving).

Hydrophilic (water-loving):

The compound has the polar group such as hydroxyl group ($\text{OH}$), acid group is called as hydrophilic.

Hydrophobic (water-fearing):

The compound has non polar group such as alkyl chain and benzene ring is called as hydrophilic.