Chapter 16, Problem 57E

Interpretation Introduction

Interpretation:

The given molecules are to be classified as a lipid, carbohydrate or amino acid.

Concept Introduction:

Lipids are cellular components that are insoluble in water. They are comprised of fats, oils, fatty acids, steroids, and some vitamins.

Fats and oils are triglycerides, which have three long hydrocarbon chains.

Carbohydrates are polyhydroxy aldehydes or ketones, or their derivatives. Carbohydrates can be identified by the presence of functional groups, $\text{C}=\text{O}$ and $\text{OH}$, along its chain and ${\text{CH}}_2\text{OH}$ group.

Amino acids are the repeating structural units in a protein molecule. Amino acids consist of the amino group and the carboxylic acid group bonded to a central carbon atom. The structure of an amino acid can be represented as follows:

$\begin{array}{l}\text{ H }\hfill \\ \text{ |}\hfill \\ {\text{NH}}_2─\text{ C }─\text{ COOH}\hfill \\ \text{ |}\hfill \\ \text{ R}\hfill \end{array}$