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What is not a function of lipids?

  1. Energy storage

  2. Cell structural role

  3. Encapsulation of DNA

  4. Catalysis of biochemical reactions

The correct answer is: Catalysis of biochemical reactions

Lipids serve multiple essential functions within biological systems. Among these functions, they are well-known for energy storage, as they provide a concentrated source of energy and are stored in adipose tissue. Additionally, lipids play a crucial structural role in forming cell membranes, contributing to the bilayer structure that is vital for cell integrity and function. Encapsulation of DNA is also a role associated with certain lipids, especially in the context of lipid-based delivery systems, commonly used in gene therapy and other medical applications, where lipid nanoparticles can encapsulate and protect DNA for transport into cells. Catalysis of biochemical reactions, on the other hand, is primarily the function of enzymes, which are proteins that accelerate chemical reactions within the body. While some lipids can have regulatory roles in signaling pathways or act as co-factors, they do not themselves catalyze reactions as enzymes do. Thus, this option is accurately identified as not being a function of lipids.