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The nucleotide's of DNA pair in a specific order, adenine always pairs with thymine and cytosine always pairs with guanine.

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The nucleotide of DNA are adenine, guanine, cytosine, thymine
The three parts of nucleotide are nitrogenous base, pentose sugar and the phosphate group

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DNA strands are made up nucleotide in a spiral staircase form, nucleotide include three parts a phosphate group, a sugar molecule and one of these four bases adenine, guanine, cytosine or thymine

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Watson and Cricks put together a model of a double helix DNA structure and also pared the DNA patterns on there model for a better image in a DNA structue
Watson and Cricks work is important because there model helped everyone get a better understanding of DNA and a better image for example everyone learned that hydrogen bonds connect the bases which pairs A-T and C-G, also showed us that the two strands are parallel but move the opposite directions.

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Rosalind Franklin studied photos of crystallized DNA fibers and focused on the DNA strands.
Rosalind Franklin's work is important because her focus and studied's on DNA strands gave us more data of the pattern of DNA and an image of the helical structure of DNA

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Friedrich Miescher discovered a new molecule  from the cells of nuclei which he called Nuclein. Nuclein is made up of hydrogen, oxygen and a ratio of phosphorus and nitrogen.
Friedrich Miescher's work is important because his work started the process of DNA and passing on traits, at the time others believed proteins were the molecules that were passed on from parent to child.