Which statement describes the function of lipids?

Lipids serve multiple critical functions in biological systems, making the statement that they serve as energy-storage molecules and chemical messengers correct.

Lipids are a diverse group of hydrophobic molecules that include fats, oils, and steroids. One of their primary roles is to store energy in the form of triglycerides. When energy is needed, these lipids can be broken down to release energy that can be utilized by the body.

Additionally, many lipids, such as steroid hormones, function as chemical messengers. These hormones play essential roles in signaling pathways throughout the body, influencing various physiological processes such as metabolism, growth, and development.

This versatile functionality of lipids is why they are integral to numerous biological processes, far beyond just structural roles or being limited to hormonal functions. They play a vital role in cellular metabolism, regulation, and maintaining homeostasis, thus demonstrating their importance in cellular functions.