Glucose and fructose are monosaccharides that have the same chemical formula, C6H12O6. However, they do not react the same chemically. Which of the following generalizations can explain this?

Monosaccharides serve different cellular functions, and they are only involved in reactions in which they are needed.
The atoms of monosaccharides are arranged differently, and the different shape gives each monosaccharide unique properties.
Monosaccharides have different properties, but the disaccharides they form when combined with other molecules will have the same properties.
The atoms of monosaccharides are arranged similarly, but the monomers from which they are formed have different physical and chemical properties.