What substance is primarily composed of fats, oils, waxes, and steroids?

Lipids are a diverse group of hydrophobic or water-insoluble biological molecules that include fats, oils, waxes, and steroids. They play several critical roles in the body, such as storing energy, forming cell membranes, and serving as signaling molecules.

Fats and oils are triglycerides, which consist of glycerol and three fatty acids. Waxes are long-chain fatty acids esterified to long-chain alcohols, providing waterproofing and protection in many organisms. Steroids, on the other hand, are characterized by a four-ring structure and include hormones like testosterone and cholesterol, which is important for cell membrane integrity.

Understanding the nature of lipids helps clarify their functions within biological systems, distinguishing them from other macromolecules like proteins, which are made of amino acids; carbohydrates, which consist of sugars; and minerals, which are inorganic elements essential for various bodily functions.