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Ok gimme a bit and ill get ya an answer, how much detail you looking for in this??
Like a paragraph
ok there is a lot in DNA, do you want how it is formed, reproduces etc
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Like if a high school teacher were to ask me questions about it, what is everything I would need to know
Ok from the top. also look at diagrams online will help
DNA- sub unit =Nucleic Acid-subunit= Nucleotides
Nucleotides= Nitrogenous base+ Pentose Sugar(5carbon sugar)+ Phosphate group(1-3)
Now the nitrogen base can be 1) Pyrimidine (Cytosine(C), Thymine(T) or Uracil(U)) or 2)Purine (Guanine(G), Adenine(A)). The pentose sugar is Ribose for DNA and Deoxyribose in RNA.
The Phosphate Group is either AMP, ADP or ATP (Adenosine Mono/Di/Triphosphate) which attach to the 5th carbon on the pentose sugar.
Now DNA is the double helical structure and each side is bonded together by Hydrogen bonds to hold it all together and keep it stable. (A) double bonds with (T) and (G) triple bonds with (C). These bonds are hydrogen bonds. Purines pair with Pyrimidines. That is the break up of the DNA. The DNA itself is two long strands with these purines or pyrimidines sticking out bonded to each other these two long strands are the phosphate group and pentose sugar unit bonded to other phosphates and sugars in the same configuration by phosphodiester bonds. This is the backbone structure of the DNA and the nitrogen bases stick out and form there hydrogen bonds and create the helical structure. Each turn of the helix contains approx 10 bases.
Nice image of this http://static.howstuffworks.com/gif/dna-base-pairings.gif