<prompt> Watson and Crick are associated withDiscovery of helical structure of DNAAssociation of Helicobacter pylori with chronic gastritisDiscovery of HIV virusNone of the above  <response>: Ans. a Discovery of helical structure of DNARef: Emery geneticsFrancis Harry Compton Crick, James Dewey Watson and Maurice Hugh Frederick Wilkins were awarded the Nobel Prize in 1962 for their discoveries concerning the molecular structure of nucleic acids and its significance for information transfer in living material. 