Utah Esthetician State Board Practice Exam

Linoleic acid is classified as what?

1. Essential amino acid

2. Saturated fat

3. Fatty acid

4. Starch

The correct answer is: Fatty acid

Linoleic acid is classified as a fatty acid. This classification is due to its structure as a carboxylic acid with a long hydrocarbon chain. Fatty acids are key components of lipids and essential in various biological functions. Linoleic acid, specifically, is known as an omega-6 fatty acid, which is essential because the body cannot synthesize it and must obtain it from dietary sources. It plays a crucial role in skin health and functions as a key element in the production of cell membranes and signaling molecules. In contrast, essential amino acids are building blocks of proteins and do not include fatty acids. Saturated fats contain no double bonds between carbon atoms and differ from linoleic acid, which has multiple double bonds. Starch, on the other hand, is a carbohydrate and entirely different from fatty acids in composition and function. Understanding these classifications helps in grasping the significance of lipids and fatty acids in skin care and health overall.