Question

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

Explanation:

Carbohydrates are macromolecules. Monosaccharides (like glucose) are the simplest form of carbohydrates. They can combine (through glycosidic bonds) to form disaccharides (e.g., sucrose, which is glucose + fructose) and polysaccharides (e.g., starch, which is a long chain of glucose units). Nucleotides are the building blocks of nucleic acids (DNA and RNA). Glycerol and fatty acids are components of lipids (e.g., triglycerides are made of glycerol + three fatty acids). Nitrogenous bases are part of nucleotides. Phosphate groups are also part of nucleotides (nucleotides consist of a nitrogenous base, a pentose sugar, and a phosphate group).

Answer:

monosaccharide