DNA stores all of ... themselves are composed of three distinct parts: sugar, phosphate, and a nitrogenous base. Here's what each of those really means. Read more: Major Scientific Discoveries ...

At King's College in London, Rosalind Franklin and Maurice Wilkins were studying DNA. Wilkins and Franklin used X-ray diffraction as their main tool -- beaming X-rays through the molecule yielded ...

Without the scientific foundation provided by these pioneers, Watson and Crick may never have reached their groundbreaking conclusion of 1953: that the DNA molecule ... of the three major ...

Interestingly, this base substitution is not the only difference between DNA and RNA. A second major difference ... poly-A tail is added to the 3' end of the mRNA molecule (Figure 7).