So before we can synthesize proteins RNA molecules must be synthesized from DNA molecules in a process known as transcription. And just like the process of DNA replication involves this protein known as DNA polymerase that catalyzes the formation of a phosphodiastor bond in the process of transcription. When we form the RNA from the DNA there is a molecule, a protein known as RNA polymerase that catalyzes the formation of the phosphodia Esther Bond. So RNA polymerase catalyzes the initiation and the elongation of that RNA polynucleotide chain. And to see what we mean by that, let's take a look at the following diagram. So in the diagram in this chemical equation we basically describe how this reaction takes place and what RNA polymerase does.