And as we'll see at the end, we can conduct many cycles to produce as many DNA copies as we want to. So let's begin with step number one. Now the entire point in this reaction is to basically use a special type of DNA polymerase molecule to basically replicate our DNA. Now, to begin the process of replication, the double stranded DNA molecule must actually separate. So we have to break the hydrogen bonds. Now what's one way to break the hydrogen bonds between the bases?