alleryStart learning →Which two monomers make up lactose?
AGlucose and galactose
BGalactose and fructose
CGlucose and fructose
DTwo units of glucose
Answer & Solution
Correct answer: A. Glucose and galactose
1. Lactose is a disaccharide, so it is built from two monosaccharide units.
2. Those units are glucose and galactose.
3. Lactose is found naturally in milk, which is why it is called milk sugar.
4. Glucose with fructose gives sucrose, and two glucose units give maltose, so those options name other disaccharides.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.2 Carbohydrates_
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