How do you recognize monosaccharides?
Monosaccharides are made by only one sugarmolecule, such as galactose, fructose or glucose. "Mono" comes from the Greek word "manos", and means one. A disaccharide contains two sugar molecules, and a polysaccharide contains several. "Di" and "poly" also come from Greek, and means "two" and "many".
Therefore, a monosaccharide is a type of sugar that only contains one sugar molecule.