Which of the following is an example of a lipid?

The correct choice highlights that vegetable oils are a prime example of lipids. Lipids are a diverse group of hydrophobic organic molecules, and they include fats, oils, waxes, and certain vitamins. Vegetable oils, being mainly composed of triglycerides (fats and oils), fall directly into this category as they are composed of glycerol and fatty acids.

Understanding the characteristics of lipids helps clarify why vegetable oils are included. They are primarily used for energy storage, insulation, and cellular structure in living organisms. The other choices do not represent lipids:

• Amino acids are the building blocks of proteins, not lipids.

• Glucose is a simple sugar and crucial for energy metabolism, classifying it as a carbohydrate, not a lipid.

• Cellulose is a complex carbohydrate that serves as a structural component in plant cell walls.

This context emphasizes the importance of correctly identifying lipids and understanding their functions in biological systems.