Question

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

Explanation:

Carbohydrates are made up of monosaccharides. Amino acids are building - blocks of proteins, phosphate groups are part of nucleic acids and phospholipids, glycerol is part of lipids, nucleotides are building - blocks of nucleic acids, and nitrogenous bases are components of nucleotides.

Answer:

monosaccharide