AP BIOLOGY

Detailed explanation-1: -Unsaturated fatty acid carbon chains contain one or more double bonds with a terminal carboxylic group (–COOH), unlike saturated fatty acids, which contain no double bonds. These fatty acids are subdivided into two groups depending on the number of double bonds.

Detailed explanation-2: -Since linoleic acid has more than one double bond (it has two), it is a polyunsaturated fatty acid. The omega numbering system has been applied to this molecule.

Detailed explanation-3: -Saturated fatty acids contain no carbon-carbon double bonds, monounsaturated fatty acids contain one carbon-carbon double bond, and polyunsaturated fatty acids contain two or more carbon-carbon double bonds.

Detailed explanation-4: -Fatty acid chains with double bonds are unsaturated (Figure 2.7. 13). Those with more than one double bond are called polyunsaturated.