What the group of monosaccharides does include?

Carbohydrates contain three important groups of molecules
and monnosaccharides group is one of them.

The formula of
monnosaccharides is (CH_2O)_n. The monnosaccharides glucose, fructose and galactose have
all the same molecular formula C_6H_12O_6 but the arrangement of the atoms in glucose,
fructose and galactose molecules is different, hence  glucose, fructose and galactose
are isomers.

The source of the energy used by the cells in
organisms is represented by the monnosaccharides. The energy is released when, in the
presence of O_2, the monosaccharides are broken down to H_2O and
CO_2.

If a covalent bond joins two monnosaccharides, the
result is disaccharides which are the nutritional source of
monosaccharides.