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The nucleotides of DNA base pairing pair by A with T the purine adenine A always pairs with the pyrimidine thymine (T) C with the pyrimidine cytosine (C) always pairs with the purine guanine.

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Friedrich Miesher in 1869 isolated a new molecule from the  cells nuclei  and called it "nuclein." His work is important because they believed proteins were the molecules by which traits passed from parents to children.

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Rosalind Franklin discovered the DNA double helix. Her work is important because the discovery of the double helix contributed worldwide wide and was one of the first woman to accomplish her work in the field.

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James Watson & Francis Crick (Discovery date 1953)

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James Watson & Francis Crick (Discovery date 1953)

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Watson and Crick worked together on studying the DNA structure the molecule that contains the hereditary information for cells. Their work is important because they discovered that the DNA molecule assumes the structure of a double helix.

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DNA is made of

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The nucleotides of DNA are cytosine, thymine, adenine, guanine, and a phosphate. The three parts of nucleotides are nitrogenous base, pentose sugar and phosphate group.