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Before DNA was actually discovered Friedrich Miescher studied it. The only evidence he had was what Charles Darwin and Gregor Mendal had discovered. He looked into a cell called leukocytes and found out they had unusual protein properties. He then compared it to DNA and found out their differences.
His work is important because he discovered a combination of protein in both DNA and RNA and called it nuclei. He is considered "The father of DNA". His discoveries helped provide many more discoveries of DNA and made it possible for cell to be distinguished.

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Gregor Mendel is known as the father of genetics. He experimented with peas that had different heights, size, shape, and color.
His work is important because he discovered how traits are passed down from parents. By experimenting with the peas he saw that the offspring of both yellow and green produced a yellow pea. But when they reproduce it has both colors. When his discovery was presented it showed that genes determine our traits.

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James Watson and Francis Crick were the ones that modeled the DNA structure. They created paper cut outs of the DNA bases (A, C, G, T) and it represented a double helix. Sugars and phosphates forms the outer strands of the helix and the bases pointing into the center.
They are important to DNA because they discovered the structure of DNA and now it helps understand how it grows. They used Rosalind Franklin's evidence of a DNA molecule.

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DNA is made up molecules called nucleotides. There are 4 nitrogenous bases A, T, G,C. Each of the nucleotide contain 3 groups, a phosphate group, a sugar group and a nitrogen base.

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The nucleotides of DNA are cytosine (C),thymine (T), adenine (A), guanine (G)
The 3 parts of of necleotides are the nitrogenous base, pentose sugar, and phosphate group.

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Each of the base pairs all have purine and pyrimidine. The nucleotides in a base pair are the same shape so it allows them to bond together with hydrogen bonds. The hydrogen bond between the bases hold the two strands of DNA together. Hydrogen bonds aren't chemical bonds so they can be disrupted and that causes the DNA strands to separate.