Which of the following kinds of lipids can act as hormones in animals?

• A. Triglycerides
• B. Phospholipids
• C. Waxes
• D. Steroids

Answer: (D)

Verified step by step guidance

1. Understand the role of lipids in biological systems: Lipids are a diverse group of molecules that include fats, oils, and hormones. They serve various functions such as energy storage, structural components of cell membranes, and signaling molecules.
2. Review the types of lipids listed in the problem: Triglycerides, phospholipids, waxes, and steroids. Each has distinct structures and functions in the body.
3. Learn about the function of steroids: Steroids are a class of lipids characterized by a four-ring structure. They act as signaling molecules (hormones) in animals, regulating processes such as metabolism, immune response, and reproduction.
4. Compare steroids to other lipids: Triglycerides primarily store energy, phospholipids form cell membranes, and waxes provide protective coatings. None of these act as hormones in animals.
5. Conclude that steroids are the correct answer: Based on their structure and function, steroids are the type of lipid that can act as hormones in animals.