High-energy bonds between phosphate groups in nucleotide triphosphates (nucleotides in which three phosphate groups are attached to the 5′ carbon atom of the deoxyribose sugar). the enzyme uses this energy to catalyze the formation of a phosphodiester bond when incorporating new nucleotides into the growing chain. how does this information explain why dna chains grow during replication in the 5′-to-3′ direction?