Which three molecules are involved in synthesis?

The three key molecules involved in synthesis are amino acids, nucleotides, and monosaccharides. Amino acids are the building blocks of proteins, nucleotides are the monomers of nucleic acids (like DNA and RNA), and monosaccharides are the simplest carbohydrates that can combine to form polysaccharides. Together, these molecules play crucial roles in the biological synthesis of macromolecules, which are essential for cellular structure and function.