And what that means is the temperature nor the PH actually changes. So inside our cells, we don't change the temperature and we don't change our PH. So how exactly do we separate the DNA strands inside our cells? Because, for example, in the process of DNA replication, we must be able to separate those DNA strands to actually replicate DNA molecules. So inside ourselves, instead of changing the PH or the temperature, we use these enzymes, these molecules proteins known as helicases. And what these helicases do is they essentially use energy molecules, ATP molecules, to break the bonds between our bases.