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Friedrich Miescher found out that nuclien is a unique molecule. His work is important because he was the first one to identify DNA as an molecule.

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Rosalind Franklin publish photo 51 x-ray image of DNA which is famous. Her work is important because she used x-ray crystallography to understand the molecule structure of DNA.

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Watson and Crick were trying to figure out the structure of DNA using some inventions from other people. Their work is important because they were the first one that has discover this DNA structure and the double helix structure

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DNA is made of nucleotide. DNA has four types of nitrogen bases which are adenine, thymine, guanine and cytosine. Also has the 3 parts of nucleotide which form a chain of DNA.

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The 3 parts of nucleotide are phosphate group, sugar group, and nitrogen base. The backbone of DNA makes up the sugar and phosphate group.

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DNA base pairing establish hydrogen bonds between A & T also with C & G. Adenine is always paired with thymine and guanine is always paired with cytosine.