Which of the following is not a type of macromolecule?

Vitamins are classified as micronutrients, not macromolecules. Macromolecules typically include proteins, carbohydrates, and lipids, which are large molecules made up of repeating units. Proteins are made of amino acids, carbohydrates are made of sugar molecules, and lipids are composed of fatty acids and glycerol. These macromolecules play crucial roles in biological processes such as providing energy, building cellular structures, and facilitating biochemical reactions. In contrast, vitamins are organic compounds that are essential for various metabolic processes but are required in much smaller quantities, distinguishing them from macromolecules.