Question

which molecule is the building block of a carbohydrate?
glycerol
phosphate group
nitrogenous base
monosaccharide
fatty acid
nucleotide

Explanation:

Carbohydrates are polymers made up of monosaccharides. Monosaccharides are simple sugars that serve as the building - blocks. Glycerol and fatty acids are parts of lipids, phosphate group and nitrogenous base are components of nucleic acids.

Answer:

monosaccharide