Question

multiple - choice question
lactose is a sugar, which macromolecule must it be?
carbohydrate
protein
nucleic acid
lipid

Explanation:

Lactose is a disaccharide (a type of sugar). Carbohydrates include sugars (monosaccharides like glucose, disaccharides like lactose, and polysaccharides like starch). Proteins are made of amino acids. Nucleic acids (like DNA and RNA) are made of nucleotides. Lipids are a diverse group including fats, phospholipids, etc. Since lactose is a sugar, it falls under carbohydrates.

Answer:

Carbohydrate