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The rules of base pairing of nucleotides will always stay the same. Adenine (a)will be with thymine(t)  and cytosine(c) will be with guanine (g)

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DNA is made up of molecules called nucleotides

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The nucleotides of DNA are the adenine(a), guanine(g), thymine(t), and cytosine(c). The 3 parts of nucleotide is are pentose, sugar and phosphate group, and nitrogenous base .

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Miescher had collected band aids that had white cells on them he washed those band aids with salt and a weak alkaline solution after this the cells started to disintegrate and it had reaveled DNA and RNA around the nucleus.  Miescher had called this nuclien. This is important because this provided groundwork for DNA discoveries.

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she was the first person to obtain the photographic for DNA To get this photograph she used an X-ray to take the picture. James Watson and Francis Crick got inspired by her work and then they started to do there own research on it. They had the same models, but the ones that took credit for it was Watson and Crick, without her work we wouldn't know how DNA looks

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Watson and crick made a DNA Structure out of paper cutouts and metal scraps, they also wrote a book about it.This DNA structure showed a representation for a double helix. Watson and Francis got their information from the photograph of Rosalind Franklin. Watson and Crick's work is important because their paper model had a copy of mechanism of genetic material.