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Friedrich Miescher (1869)
Friedrich Miescher discover a combination of protein, DNA, and RNA near the nucleus and name it nuclien. His work is important because he was the first person to discover it and discover the use of Nuclein which stored phosphorous atoms. Also nuclien was later called DNA which was identify as a distinct molecule.

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Rosalind Franklin help to understand DNA more when she discover the fine molecular structures of DNA and RNA with her x-ray that showed a helix shape. Rosalind Franklin work is important because it helped scientists link it to roles in genetics and the cell metabolism.

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James Watson & Francis Crick were the ones to solve the structure of DNA with the data provided by other scientists, like Maurice Wilkins & Rosalind Franklin. Their work is important because with the research they did and the help from the other scientist data they discover its structure more better that helped scientists understand how genetic information is passed from parents to offspring.

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DNA is made of molecules called nucleotides. Each Nitrogenous bases are base pair. DNA has a helix shape which have sugar phosphate backbone and is made of four types of nitrogen bases.

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The nucleotides of DNA are called adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines a organisms DNA 's instructions or genetic code. The 3 parts of nucleotides are made up of the phospahte group, sugar group, and nitrogenous group base.

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Their are two helix strands that are connected between nucleotides that are called base pairs. There are two types of base pairing that occur nucleotide A is pairs with T, and nucleotide C pairs, with G.