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Dna pairing works because the the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G).

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The nucleotide in DNA consists of a sugar. Within this are 4 different nitrogen bases cytosine ,thymine, adenine , and guanine. The nucleotide has three parts the nitrogenous Base,pentose sugar and phosphate group.

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DNA structures each contain nucleotides. Within these nucleotides there are three groups: the phosphate,sugar group and the nitrogen base. There's 4 different nitrogen bases cytosine (C),thymine (T), adenine (A), and guanine (G).The variety of structures of these nitrogen bases is what makes everything unique.

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James and Francis both discovered the structure of DNA. They found that the structure of DNA is actually a double-helix polymer. Their discovery was a great breakthrough in science with this discovery they were able to do screenings of diseases.

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Rosalind Franklin discovered that there two forms of DNA. Dry "A"and wet "B" these forms were discovered through an image captured by both her and co-worker Raymond. Her work is important because that image of wet "B' or photograph 51 became critical evidence with identifying the structures of DNA.

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Friedrich Miescher was the first scientist that was cable of separating the nuclei from the cell nuclei. His work is important because he was the first scientist to identify Dna as a molecule. His work although not very recognized helped further molecular discoveries.