In other words, DNA polymerase catalyzes the attachment of the next deoxyribonucleotide phosphate to the 3´ end of a new DNA strand. This attachment is called a phosphodiester bond. The nucleic acids that belong together are joined firmly by the "matchmaker" DNA polymerase. That's right! Ha ha ha... ... rNA structure On the other hand, RNA usually exists as a single strand. The enzyme RNA polymerase actually uses DNA as a template when it binds ribonucleotides