Which of the following is NOT a function of lipids?

• A. Component of cell membranes
• B. Energy storage
• C. Catalyzing biochemical reactions
• D. Insulation and protection

Answer: (C)

Verified step by step guidance

1. Step 1: Begin by understanding the primary functions of lipids in biological systems. Lipids are a diverse group of molecules that play key roles in energy storage, structural components of cell membranes, and insulation/protection.
2. Step 2: Recall that lipids are hydrophobic molecules, meaning they do not mix well with water. This property makes them ideal for forming cell membranes, as they create a barrier that separates the internal environment of the cell from the external environment.
3. Step 3: Understand that lipids are also used for long-term energy storage. For example, triglycerides store energy in the form of fatty acids, which can be broken down during metabolism to release energy.
4. Step 4: Recognize that lipids provide insulation and protection. For instance, adipose tissue (fat) helps insulate the body and protect organs from physical damage.
5. Step 5: Note that catalyzing biochemical reactions is not a function of lipids. This role is typically performed by enzymes, which are proteins. Lipids do not have the structural or functional properties required to act as catalysts in biochemical reactions.