And these two different types of nucleic acids contain two different types of sugar molecules. In fact, the RNA and DNA nucleic acids get their name from the type of sugar that is found within the nucleic acid. So let's begin with RNA. So RNA contains the ribo sugar and that's why we call RNA ribonucleic acid. On the other hand, DNA contains the deoxyribar. And that's exactly why we call DNA deoxyribonucleic acid.