Who discovered DNA was it James Watson and Francis Crick or Friedrich Miescher ?
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The discovery of DNA is credited to Friedrich Miescher, a Swiss biologist. In the late 1860s, Miescher isolated a substance from the nuclei of white blood cells, which he called "nuclein." This substance was later identified as DNA (deoxyribonucleic acid). Miescher's work laid the foundation for understanding the molecular structure and functions of DNA.
However, it was James Watson and Francis Crick who successfully determined the structure of DNA in 1953. They proposed the famous double helix model, which showed how DNA is structured as a twisted ladder-like molecule. Watson and Crick's discovery was based on a combination of their own research, data from other scientists like Rosalind Franklin, and careful analysis and interpretation of the available evidence.
So, to answer your question, Friedrich Miescher discovered DNA, but James Watson and Francis Crick are credited with uncovering its structure.