Final answer:
Francis Crick and James Watson used X-ray crystallography to study molecular structures which were vital to the discovery of DNA. They used data from Rosalind Franklin's X-ray crystallography experiments to determine the structure of DNA.
Step-by-step explanation:
Francis Crick and James Watson designed a technique called X-ray crystallography to study molecular structure, which was vital to the discovery of DNA. They used data from researcher Rosalind Franklin's X-ray crystallography experiments to piece together the structure of the DNA molecule. In 1962, James Watson, Francis Crick, and Maurice Wilkins were awarded the Nobel Prize in Medicine for their contributions to understanding the structure of DNA.