Which of the following statements about fatty acids and triglycerides is true?

Fatty acids and triglycerides play a crucial role in the structure of cell membranes, making the statement about their importance structurally in cell membranes accurate. Phospholipids, which are derived from fatty acids, form the bilayer structure of cell membranes. This bilayer is essential because it provides a barrier that separates the interior of the cell from the external environment, while also facilitating the movement of substances in and out of the cell. Additionally, the fluidity of the membrane is influenced by the types of fatty acids present, affecting how proteins and other molecules interact within the membrane.

Other statements in this context do not correctly represent the roles of fatty acids and triglycerides. They are indeed high in energy, serving as a major source of energy for the body. They are not solely for fat storage, as they also have functional roles in signaling pathways and providing structural integrity to membranes. Furthermore, fatty acids and triglycerides do participate in the transport of fat-soluble vitamins (A, D, E, and K) within the body, contradicting the suggestion that they have no role in vitamin transport.