Eventually they reach our promoter region and then the RNA polymerase joins and it unwinds our double stranded molecule, our double helix and it creates this transcription bubble. And now as our RNA polymerase moves across this upper strand which runs from the three to the five direction it uses this strand to basically synthesize our RNA molecule. So it uses this trend because just like DNA polymerase RNA polymerase can only read our DNA strand beginning at the three N and ending at the five end. So it synthesizes our RNA beginning at the five end and ending at the three end as shown in a following diagram. So this green strand is in fact our RNA strand. Now the DNA strand that is used to actually synthesize the RNA strand is known as the template strand or more commonly the antisense strand.