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![[-- double helix --]](Images/Terms/double_h.gif)
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| defined: |
The structural arrangement of DNA, which looks something like an immensely long ladder twisted into a helix, or coil. The sides of the "ladder" are formed by a backbone of sugar and phosphate molecules, and the "rungs" consist of nucleotide bases joined weakly in the middle by hydrogen bonds.
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| explained: |
Listen to a detailed explanation.
Dr. Francis Collins, director of the National Human Genome Research Institute, defines double helix. |
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related terms: |
base pair, deoxyribonucleic acid (DNA), nucleotide | |
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