In the case of RNA, we have the ribosugh. In the case of DNA we have the deoxyribose sugar. And deoxy simply means on the second carbon, we don't have a hydroxyl group. So if we take a look at the following molecule so if this base is, let's say, adenine, then this molecule would be that ATP molecule that we spoke of earlier. So we have the triphosphate group, we have that nitrogenous base and these two groups are essentially connected to one another as a result of this sugar. So this is a ribosugar that bridges these two molecules.