Question: who proposed the first accurate model of dna
[{'answer': 'Watson', 'provenance': [{'wikipedia_id': '69778', 'title': 'Semiconservative replication', 'start_paragraph_id': 2, 'start_character': 22, 'end_paragraph_id': 2, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Crick', 'provenance': [{'wikipedia_id': '69778', 'title': 'Semiconservative replication', 'start_paragraph_id': 2, 'start_character': 33, 'end_paragraph_id': 2, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '69778', 'title': 'Semiconservative replication', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10284723279992579568}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '69778', 'title': 'Semiconservative replication', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 694, 'bleu_score': 0.6706253976277481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10284723279992579568}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43660903', 'title': 'Jacques Mering', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ["Recherche Scientifique (CNRS; the French National Centre for Scientific Research) in Paris, and subsequently Director of CNRS Laboratory in Orléans. Perhaps, Mering is best remembered for his inspiration and influence on the British chemist Rosalind Franklin, whom he trained in X-ray crystallography. Franklins' X-ray crystallographic image, popularised as Photo 51, became the single piece of clue for the discovery of the double-stranded helical structure of DNA by James Watson and Francis Crick in 1953. Mering was born in Vilkaviškis, Russia,", "Recherche Scientifique (CNRS; the French National Centre for Scientific Research) in Paris, and subsequently Director of CNRS Laboratory in Orléans. Perhaps, Mering is best remembered for his inspiration and influence on the British chemist Rosalind Franklin, whom he trained in X-ray crystallography. Franklins' X-ray crystallographic image, popularised as Photo 51, became the single piece of clue for the discovery of the double-stranded helical structure of DNA by James Watson and Francis Crick in 1953. Mering was born in Vilkaviškis, Russia,", "Recherche Scientifique (CNRS; the French National Centre for Scientific Research) in Paris, and subsequently Director of CNRS Laboratory in Orléans. Perhaps, Mering is best remembered for his inspiration and influence on the British chemist Rosalind Franklin, whom he trained in X-ray crystallography. Franklins' X-ray crystallographic image, popularised as Photo 51, became the single piece of clue for the discovery of the double-stranded helical structure of DNA by James Watson and Francis Crick in 1953. Mering was born in Vilkaviškis, Russia,"]}}]}, {'provenance': [{'wikipedia_id': '69778', 'title': 'Semiconservative replication', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['The (as deciphered by Watson and Crick in 1953) suggested that each strand of the double helix would serve as a template for synthesis of a new strand. However, it was not known how newly synthesized strands combined with template strands to form two double helical DNA molecules. The semiconservative model of replication seemed most reasonable since it would allow each daughter strand to remain associated with its template strand. The semiconservative model was anticipated by Nikolai Koltsov, is supported by the Meselson-Stahl experiment as well as subsequent experiments that enabled autoradiographic visualization of the distribution of old and new strands within replicated chromosomes. Experimental evidence confirmed that two lines were observed, therefore offering compelling evidence for the semi-conservative theory.', 'The (as deciphered by Watson and Crick in 1953) suggested that each strand of the double helix would serve as a template for synthesis of a new strand. However, it was not known how newly synthesized strands combined with template strands to form two double helical DNA molecules.', 'The (as deciphered by Watson and Crick in 1953) suggested that each strand of the double helix would serve as a template for synthesis of a new strand. However, it was not known how newly synthesized strands combined with template strands to form two double helical DNA molecules. The semiconservative model of replication seemed most reasonable since it would allow each daughter strand to remain associated with its template strand. The semiconservative model was anticipated by Nikolai Koltsov, is supported by the Meselson-Stahl experiment as well as subsequent experiments that enabled autoradiographic visualization of the distribution of old and new strands within replicated chromosomes. Experimental evidence confirmed that two lines were observed, therefore offering compelling evidence for the semi-conservative theory.']}}]}, {'provenance': [{'wikipedia_id': '57936783', 'title': 'Genetics in fiction', 'section': 'Section::::Background.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['Molecular biology, the interactions and regulation of genetic materials, began with the identification in 1944 of DNA as the main genetic material; the genetic code and the double helix structure of DNA was determined by James Watson and Francis Crick in 1953. DNA sequencing, the identification of an exact sequence of genetic information in an organism, was developed in 1977 by Frederick Sanger. Genetic engineering, the modification of the genetic material of a live organism, became possible in 1972 when Paul Berg created the first recombinant DNA molecules (artificially assembled genetic material) using viruses. Cloning, the production of genetically identical organisms from some chosen starting point, was shown to', 'Molecular biology, the interactions and regulation of genetic materials, began with the identification in 1944 of DNA as the main genetic material; the genetic code and the double helix structure of DNA was determined by James Watson and Francis Crick in 1953. DNA sequencing, the identification of an exact sequence of genetic information in an organism, was developed in 1977 by Frederick Sanger. Genetic engineering, the modification of the genetic material of a live organism, became possible in 1972 when Paul Berg created the first recombinant DNA molecules (artificially assembled genetic material) using viruses.', 'Molecular biology, the interactions and regulation of genetic materials, began with the identification in 1944 of DNA as the main genetic material; the genetic code and the double helix structure of DNA was determined by James Watson and Francis Crick in 1953. DNA sequencing, the identification of an exact sequence of genetic information in an organism, was developed in 1977 by Frederick Sanger. Genetic engineering, the modification of the genetic material of a live organism, became possible in 1972 when Paul Berg created the first recombinant DNA molecules (artificially assembled genetic material) using viruses. Cloning, the production of genetically identical organisms from some chosen starting point, was shown to']}}]}, {'provenance': [{'wikipedia_id': '395970', 'title': 'James Watson (disambiguation)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['James Watson (born 1928) is an American biologist and chemist, the co-discoverer of the double-helical structure of DNA, awarded the 1962 Nobel Prize in Physiology or Medicine.', 'James Watson (born 1928) is an American biologist and chemist, the co-discoverer of the double-helical structure of DNA, awarded the 1962 Nobel Prize in Physiology or Medicine.', 'James Watson (born 1928) is an American biologist and chemist, the co-discoverer of the double-helical structure of DNA, awarded the 1962 Nobel Prize in Physiology or Medicine.']}}]}]