Question

question
glucose and fructose are ________, which ________.
answer
carbohydrates; are glycerol molecules
monosaccharides; are two disaccharides linked together
isomers; have the same molecular formula but different structures
disaccharides; are two monosaccharides that are linked together
i dont know yet

Explanation:

Glucose and fructose have the molecular formula $C_6H_{12}O_6$ but different structures, making them isomers. Monosaccharides are single - sugar units, and disaccharides are two monosaccharides linked. Glycerol is a different type of molecule.

Answer:

C. isomers; have the same molecular formula but different structures