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The middle of the spiral has bases that contain nitrogen.  However, only adenine and thymine could bond.  The same thing goes to cytosine and guanine.

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The spiral-shaped nucleotides has three main parts.  They are phosphate groups, sugar molecules, and one of the four bases. Those bases could be adenine, cytosine, guanine or thymine.

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DNA is made up of four main codes and is spiral.

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These two gentlemen contributed towards finding the true shape of DNA. The men used scraps of materials like metal and paper. The shape revealed was alike to a twisted ladder. This is important because this makes it clearer to find the genetic code.

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Rosalind Franklin was a rare scientist at the time because she was a female born in the year of 1920. She was the first scientist to take a high resolution picture of a DNA fiber. Her action is very important because the visual helps determine the shape of the DNA.

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Basel, Switzerland was home to Friedrich  Miescher.  He was born in the year of 1844.  Later in his lifetime, he made an important discovery.  In the year 1869 he discovered the nuclein. His discovery is important because it was the initiation to the DNA discovery.