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The Double Helix Considering the complex functions of DNA, its structure is simple. The two DNA strands run in opposite directions and twist together to form a stable double helix. During replication or gene transcription, the 2 strands unwind and unzip. This allows one or both strands to be copied after which the strands are able to re-associate and twist back to their helical structure.

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      Keywords:

      dna structure,NSDL,dna strands,structure concepts,gene transcription,double helix,replication,animation,NSDL_SetSpec_BEN,narration,Life Science,helical structure,Chemistry,biological elements,oai:nsdl.org:2200/20081106034047414T,base pairing

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      English

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