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What Friedrich Miescher discovered a nuclien DNA in the year of 1869. Friedrich Miescher found a new molucue from the cells called nuclei which the other name he named it was "nuclein". The nuclien contains hyrdrogen ,oxygen, and unique ratio to nitrogen. His work is important because he found the DNA first and he made us how to learn more about DNA. Also his DNA is good because he explains what the "nuclien" has and we won't probably find that DNA that he found so,that is a good reason his work important and probably we will take years to find it or probably never thanks to him we have a DNA called "Nuclein".

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Rosalind Franklin what she has to do with the DNA is that she was very smart on the jobs of X-Ray and she would ask people for there ideas,and opinions. She would also have good pictures of her DNA and some good evidence to beck it up. Rosalind also found out that her DNA was a shape like a formula of a twisting thing that increased it's size every time bigger and bigger. Her work is important because she can explain her own DNA on a picture and do it on her own words. She knows how to describe when the DNA is twisting and getting larger every time.

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The thing that James Watson & Francis Crick have to do in the DNA is like the same thing as Rosalinda Franklin they find pictures or structures of DNA and they describe it on there own words the DNA that they had found already. The things that are important in there work is that they also found out that there are three DNA groups. They saw that there DNA was being twisted and it was growing and just kept on being bigger and bigger.

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The way that nucleotide base their pair is by the chain joins of sugar and the phosphate creates a backbone. Also the purine bases on adenine and guanine and pyrimidine occur in the DNA and the RNA.

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The Nucleotide of DNA are adenine,thymine,guanine, and cytosine those are the nucleotide of DNA. The three parts of nucleotide are nitrogenous base, a sugar and a phosphate group those are the three parts of nucleotide.

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DNA is made of molecules that are called nucleotide. Also in every nucleotide there is always going to be a phosphate,sugar, and nitrogen.There are four types of nitrogen that make the group they called thymine,guanine,adenine,and cytosine.