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A DNA molecule has a double helix structure, consisting of two intertwined strands formed by nucleotides. Each nucleotide contains a sugar, a phosphate group, and a nitrogenous base, with the bases pairing specifically (adenine with thymine and cytosine with guanine) through hydrogen bonds. This structure enables DNA to store and transmit genetic information, as well as to undergo replication during cell division. Additionally, the sequence of bases along the strands encodes the instructions necessary for building and maintaining an organism.

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