Which of the following statements is true about plants? a. plant cells do not have membrane-bound nuclei. b. plants have a single generation life cycle. c. plants are members of the domain prokarya. d. plant cells have cell walls made of cellulose.

American scientist, linus pauling, was one of many scientists racing to discover the molecular structure of dna. pauling initially thought that the molecule was a triple helix. later, james watson and francis crick unveiled their double helix model, which turned out to be an accurate description of the molecule's shape. why did watson and crick succeed when pauling failed?