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Unformatted text preview: 3. Two polynucleotide chains are anti-parallel. 4. Sugar phosphate backbone (negative charge) is oriented to the outside; the bases face the interior of the molecule. The bases are planar and "stack" on one another. 5. Opposite strands are bonded by hydrogen bonds. 6. Bases are 0.34 nm apart. One turn of the helix is 3.4 nm. There are 10 bases/turn (1 = 0.1 nm). 7. There is a major and a minor groove between the backbone....
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- Spring '10