So this is the general equation that describes RNA polymerase. Now, to actually work, what does RNA polymerase actually need? Well, it needs three different things. It basically means the building blocks, the ribonucleotide triphosphates and there are four different types. So we have adenosine five triphosphate we have guanosine five triphosphate we have citadine five prime triphosphate and we have uridine five prime triphosphate. And these building blocks are needed to actually synthesize and elongate that polynucleotide chain.