Which category includes ex. vegetable oils, nut oils, some dairy products?

• A. Lipids
• B. Carbohydrates
• C. Proteins
• D. Vitamins

Answer: (A)

The main idea here is how bio-molecules are grouped by their chemical nature and typical roles. Vegetable oils and nut oils are fats, and many dairy products contain fat as well. That whole group falls under lipids, which are hydrophobic molecules that store energy efficiently as fats and oils and also include other molecules used in cell membranes and insulation. This makes lipids the best fit for these examples.

Carbohydrates are sugars and starches that provide quick energy and are generally water-soluble, not fats. Proteins are built from amino acids and perform a wide range of functions like enzymes and structures. Vitamins are micronutrients needed in small amounts for metabolism, not the fat category itself.