DNA. DNA-Deoxyribonucleic Acid- molecule that contains genetic information. Genes are segments of DNA. Chromosomes are strands of DNA. In the 1950’s it was understood that DNA was the molecule that stored genetic information but the structure was unknown. DNA. Structure of DNA.
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"...It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material.”
-Watson, J.D., and Crick, F.H.C. 1953."Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid" Nature, April 25, 1953. vol. 171:737-738.