And when it does make a mistake, it can basically fix that mistake on its own accord. In fact, for every 100 million nucleotides that the DNA polymerase lays down correctly, it only makes one mistake and that's a very, very high accuracy. So DNA polymerase has the ability to remove and replace nucleotides that have been incorrectly placed. This means that DNA polymerases rarely make mistakes and when they do, they can fix the mistakes on their own. So let's take a look at the following diagram which basically describes how we form the phosphor diaster body. And as we discuss this, we can imagine that the DNA polymerase molecule hovers about this position and catalyzes the formation of this phosphodiastor bond.