Final answer:
Friedrich Miescher first identified DNA in 1869 when he isolated a substance called nuclein from white blood cells. Subsequent significant contributions were made by Watson, Crick, Franklin, and Chargaff to reveal DNA's structure and significance. Thus, Miescher's discovery laid the groundwork for modern genetics.
Explanation:
Who First Identified DNA?
The first identification of DNA is credited to the Swiss biochemist Friedrich Miescher, who discovered this essential molecule in 1869. During his work at the University of Tübingen, Miescher isolated a substance he called "nuclein" from the nuclei of white blood cells. This substance later proved to be DNA.
While Miescher discovered DNA, it wasn’t until much later that the structure and function of DNA were elucidated by scientists such as James Watson, Francis Crick, and Rosalind Franklin. Watson and Crick determined the double helix structure of DNA in 1953, utilizing x-ray diffraction images produced by Franklin. Also, Erwin Chargaff contributed to this field by establishing rules about the pairing of nitrogenous bases, known as Chargaff's rules.
In summary, although many key figures contributed to our understanding of DNA, the first identification of this important molecule belongs to Friedrich Miescher.
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