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Friedrich Miescher started by investigating Leukocytes. He compared the composition of DNA to these proteins and pointed the distinct differences. He discovered a combination of Protein, DNA, and RNA near the nucleus and named it nuclein. During Miescher's lifetime, no one discovered the use of Nuclein and Mieschers guess was that it stored Phosphorous atoms.

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Rosalind Franklin obtained photo 51, the most famous x-ray image of DNA, which took her 100 hours to get the image and a whole year to analyze.  Her work is important because, without her photo, Watson and Crick would have never figured out what the DNA structure looks like.

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Watson and Crick were the ones that found out the structure of DNA,(with Rosalind Franklin's help of course) which looks like a twisted ladder. Their work is important because now people could understand how it grows and could begin to grow DNA molecules themselves.

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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 thymine, guanine, adenine, and cytosine. The order of these bases is what determines DNA instructions, or genetic code.

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The nucleotides of DNA are Thymine. Cytosine, Adenine, and Guanine.
The 3 parts of nucleotides are Nitrogenous Base, the pentose sugar, and the phosphate group.

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Base pairs, attached to each sugar ring is a nucleotide base. The hydrogen bonding between complementary bases holds the two strands of DNA together, are not chemical bonds.