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The Structure of DNA

Deoxyribose nucleic acid (DNA) is a polymer with repeating subunits called
nucleotides. Each of these nucleotides has three subunits: deoxyribose (sugar
molecule), a phosphate, and a nitrogenous base. The nitrogenous base is the only
thing that differs between different nucleotides. There are four possible bases:

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The DNA molecule has two polynucleotide strands held together by hydrogen
bonding between the pairs of nitrogenous bases. These always pair in the same way:
Adenine with Thymine and Cytosine with Guanine.

The two polynucleotide
strands run in opposite directions. The DNA molecule has been referred to as a


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