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In 1869 Friedrich Miescher identified nuclein which is a combination of protein, DNA and RNA. It was near the nucleus so that is why he called it nuclein. His work is important because the separation of nuclein from the nucleus provided the groundwork for many DNA discoveries to come since it was now possible to distinguish a part of a cell from the entire thing.

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Rosalind Franklin generated DNA crystals and shot x-rays through them to study their structure. Then in 1952 she got photo 51, it was an x-ray image of DNA. They didn't give her work credit because someone who worked with her showed her work to Watson and Crick. Her work is important because now we know what DNA looks like.

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Watson and Crick were also trying to figure out what the structure of DNA looked like. They tried all the possible unions between A and T and G and C. There was two bonds between A and T and three between C and G which made a double helix but Watson and Crick had already seen Franklin's model of the structure.

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DNA is made up of two chemicals called nucleotides and were know as the chemical letters A C G and T. They stand for Adenine, Cytosine, Guanine and Thymine. The structure looks like a double helix.

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The Nucleotides of DNA are Adenine, Cytosine, Guanine and Thymine. The three parts of nucleotides are Nitrogenous base, Pentose sugar and a phosphate group.

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Nucleotides pair by A, T, C and G. Adenine pairs with Thymine and Cytosine pairs with Guanine.