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Friedrich Miescher collected band aids with white blood cells. He washed those band aids with salt and a weak alkaline solution. This caused the membrane and the cell to break down which revealed DNA and RNA around the nucleus. He called this the nuclien. The reason why his work was so important is because it set the groundwork for future DNA discoveries.

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Rosalind Franklin had been the first to get photographic evidence of DNA. She used an x-ray to take the picture. James Watson and Francis Crick had seen Franklin's picture and were inspired to do their own research. They both had the same model, but Watson and Crick had gotten the credit for making it. Without her work we wouldn't really know how DNA looks like.

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James Watson and Francis Crick created a double helix model of DNA out of paper cutouts and metal scraps, and they wrote a book about it. They got their information from Rosalind Franklins picture that was shown to them by Maurice Wilkins. Their work is important because it suggested that there was a copying mechanism for genetic material.

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DNA is made up of several molecules called nucleotides.

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The four nucleotides are adenine(a), guanine(g), Thymine(t), cytosine(c). The three parts of nucleotides are nitrogenous base, pentose sugar, and phosphate group.

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The nucleotides are always paired the same way. Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G).