Our primase actually lays down many of these RNA primers. So we have one two RNA primers as shown and our DNA polymerase binds to each one of these primers and it creates our blue strands which are the dota strands in the opposite direction with respect to the movement of this DNA polymerase and this DNA helicase molecule. So the DNA polymerase is still synthesizing in the five to three fashion, but in this case, it must move in the opposite direction with respect to this DNA polymerase. So we see that this trend that is synthesized in a continuous fashion, piece by piece, is known as the leading strand. But this trend is known as the lagging strand because each one of these fragments is synthesized piece or is synthesized one at a time. First we synthesize this fragment, then we synthesize this fragment, then we have to synthesize this fragment, and so forth.