Glucose is a ______ and has ______ carbons.

• A. isomer; 6
• B. monosaccharide; 5
• C. monosaccharide; 6
• D. disaccharide; 6

Answer: (C)

Glucose is a monosaccharide, a simple carbohydrate. It is a hexose, meaning it has six carbon atoms (its formula is C6H12O6). This distinguishes it from pentoses, which have five carbons, and from disaccharides, which are made of two sugar units. Glucose can have isomeric forms, but that describes different arrangements of the same atoms rather than its basic classification. So the statement that best fits is that glucose is a monosaccharide with six carbons.