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Life Sciences Practice Test: Structure of dsDNA
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Double-stranded DNA (dsDNA) is a double helix, meaning it has two strands that twist around each other like a spiral staircase. The strands run antiparallel, with the 5' end of one strand parallel to the 3' end of the other.

The structure of dsDNA includes:
Backbone:
The outside of the molecule, made of alternating deoxyribose sugars and phosphates.
Nucleotides: A repeated pattern of a phosphate group, a sugar group, and a base.
Hydrogen bonds: Non-covalent bonds that bind the strands together.

Life Sciences Practice Test: Structure of dsDNA
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1 Questions

1. Which form of DNA is described by Watson-Crick model?