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A DNA molecule is composed of Deoxyribose, sugar base, bonded to phosphate by a covalent bond, which according to if Adenine and Thymine bond, will results in a double hydrogen bond, or Guanine and cytosine which results in a triple hydrogen bond. The DNA molecule is a double stranded helix wich is anti-paralell, because one goes in the direction of 5'-3' and the other one from 3'-5'. Which is why the lagging strand 3'-5' requires additional enzymes for replication.

here is a good picture that might help you understand:

http://en.wikipedia.org/wiki/File:DNA_chemical_structure.svg

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15y ago

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