1. What is a lipid? A) A carbohydrate that stores energy B) An organic compound, such as fat or oil C) A type of protein used for cell functions D) A nucleic acid responsible for genetic material

The correct answer is: **B) An organic compound, such as fat or oil** **Explanation:** Lipids are a diverse group of organic compounds that are insoluble in water but soluble in nonpolar solvents. They include fats, oils, waxes, phospholipids, and steroids. Lipids play several essential roles in the body, including energy storage, forming cell membranes, and serving as signaling molecules. - **A) A carbohydrate that stores energy**: This describes carbohydrates like glycogen or starch, not lipids. - **C) A type of protein used for cell functions**: This refers to proteins, which have different structures and functions compared to lipids. - **D) A nucleic acid responsible for genetic material**: This describes nucleic acids such as DNA and RNA, which are distinct from lipids.