The fork of replication is basically the location of our DNA helicase. So we can imagine that DNA helicase moves in the left directions towards the left along the x axis we have the DNA gyrase that basically induces those negative super coils that decreases the stress involved with unwinding. And we have the SSB proteins, the single stranded binding proteins that basically act to make sure that those two single strands do not reassociate with one another. And once we unwind, what happens is the DNA polymerase shown in red basically binds onto our single stranded DNA molecules and it creates those phosphodia ester bonds by combining, by attaching our nucleotides together. So first we form the RNA primer by using our primase enzyme and this is shown in purple. And then we basically create those other nucleotides by using our RNA polymerase or DNA polymerase.