Which statement best describes a polyunsaturated fatty acid?

A polyunsaturated fatty acid is characterized by having multiple double bonds within its carbon chain. This structural feature allows for a greater degree of fluidity in the fatty acid, which can contribute to various biological functions, including the fluidity of cell membranes and the regulation of metabolic processes.

Polyunsaturated fatty acids are essential in the diet and are known to play a crucial role in heart health and inflammation regulation. Examples include omega-3 and omega-6 fatty acids, which are vital for various physiological functions and must be obtained through food sources.

In contrast, the other descriptions refer to different types of fatty acids: those with a single double bond are classified as monounsaturated, while those with no double bonds are saturated fatty acids. Therefore, the presence of multiple double bonds distinctly categorizes polyunsaturated fatty acids, setting them apart from mono and saturated types.