Each helical chain in a DNA molecule has a nitrogen base backbone toward the outside, and phosphate-sugars compose the inner, interlocking base pairs of the interior.

Name: Each helical chain in a DNA molecule has a nitrogen base backbone toward the outside, and phosphate-sugars compose the inner, interlocking base pairs of the interior.
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In a DNA molecule, the phosphate-sugar backbone is on the outside, while the nitrogenous bases form the interlocking base pairs on the interior.

Each Helical Chain in a DNA Molecule Has a Nitrogen