What is the monomer of carbohydrate?

• A. Fructose
• B. Glucose
• C. Galactose
• D. Sucrose

Answer: (B)

Carbohydrates are built from small sugar units called monosaccharides, the basic building blocks. When we talk about the monomer, we’re looking for the single sugar that commonly serves as the repeating unit in larger carbohydrates. Glucose fits this role as the standard monosaccharide used to construct many polysaccharides like starch, glycogen, and cellulose, and it is a primary energy source in biology. Fructose and galactose are also monosaccharides, but they aren’t the typical repeating unit for the main storage and structural carbohydrates. Sucrose is a disaccharide, made from glucose and fructose, so it isn’t a monomer. That makes glucose the best answer.