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Friedrich Miescher researched white blood cells (white blood cells are found in large quantities in infections) .Miescher decide to collected bandages with infectious materials from a nearby clinic for his research. By 1869 Friedrich Miescher deiced to isolate a new molecule from the cells’ nuclei and call it “nuclein.”

His work is important because he helped many other scientist find out what DNA was made of .

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Rosalind Franklin and a student of hers made a great discovery when they took pictures of DNA and discovered that there were two forms of DNA.There was a dry "A" form and a wet "B" form. One of their X-ray diffraction pictures of the "B" form of DNA (known as Photograph 51'). This became a famous critical evidence in identifying the structure of DNA.

Rosalind Franklin is important to the understanding DNA because she identified the structure of DNA and also found out there was two forms of DNA.

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Though DNA was discovered in 1869, its crucial role in determining genetic inheritance wasn’t demonstrated until 1943. In the early 1950s, Watson and Crick were only two of many scientists working on figuring out the structure of DNA. In 1953 Francis Crick and James Watson announced that they had determined that the double-helix structure of DNA contained molecules of human genes.

Francis Crick and James Watson are important because thanks to the help of Rosalind Franklin they discovered that DNA molecule assumes the structure of a double helix.

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DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).

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The nucleotide in DNA consists of a sugar and one of four bases cytosine, thymine , adenine , guanine , and a phosphate.
The tree parts of nucleotides are nitrogenous base,Purines and pyrimidines

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There are two strands of DNA that are connected to each other by base pairing. A always pairs up with T and C pairs up with G. This base pairing then connects the two DNA straps together.