Now, what exactly is the meaning behind the absence of this hydroxyl group? Well, it turns out that because that hydroxyl group is not present in deoxyribosugar, that actually stabilizes our structure of DNA because it makes it much more resistant to hydrolysis by different types of nucleophiles. And we'll talk more about that in just a moment. So the absence of the hydroxyl and second carbon of the sugar molecule found on DNA makes DNA more stable and more resistant to hydrolysis than the RNA molecules. Now let's move on to something called a backbone. So, previously, when we introduced nucleic acids we said that a certain part of the nucleic acid is known as the backbone.