So let's discuss what we just said by looking at the following diagram. So basically this is our double stranded DNA. So this is the three end. This is the five end of the single strand shown above and this is the five and this is the three end of the single stranded DNA molecule shown below and they're connected via hydrogen bonds between our nitrogenous bases. Now this is our RNA polymerase as well as our initiation factors. And as the initiation factors move across eventually they come across a region, a sequence of DNA nucleotides known as the promoter region that basically signals our RNA polymerase to begin unwinding and to begin the synthesis process.