Washington Master Esthetics Practice Exam

Which of the following is an example of a polyunsaturated fat?

1. Aphla-linolenic acid

2. Oleic acid

3. Stearic acid

4. Palmitic acid

The correct answer is: Aphla-linolenic acid

Polyunsaturated fats are characterized by having multiple double bonds in their chemical structure, which distinguishes them from monounsaturated and saturated fats. Alpha-linolenic acid is an omega-3 fatty acid and is classified as a polyunsaturated fat because it contains more than one double bond within its carbon chain. These types of fats are essential fatty acids, meaning they must be obtained through diet, as the body cannot produce them. In contrast, oleic acid is a monounsaturated fat, which has just one double bond. Stearic acid and palmitic acid are both saturated fats, which means their carbon chains are fully saturated with hydrogen atoms, having no double bonds. Understanding the distinctions between these types of fats is crucial for nutritional science, as polyunsaturated fats are associated with several health benefits, including improved heart health and reduced inflammation.