Legend:
The double helix of the DNA is shown along with details of how the bases, sugars and phosphates connect to form the structure of the molecule.
DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase). Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases. The bases are adenine (A), thymine (T), cytosine (C) and guanine (G).
A and T are connected by two hydrogen bonds. G and C are connected by three hydrogen bonds.
A and T are connected by two hydrogen bonds. G and C are connected by three hydrogen bonds.
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