Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule?

Lactose is formed by joining two simple sugars: galactose and glucose. A carbohydrate made of two monosaccharides is called a disaccharide, so lactose is a disaccharide. A monosaccharide is just one simple sugar, while starch is a large carbohydrate made of many glucose units.

AI-written and checked against the verified answer.