DNA complementary base pairing (Watson–Crick hydrogen bonds) (A pairs with T via 2 H-bonds; G pairs with C via 3 H-bonds (DNA))
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A pairs with T via 2 H-bonds; G pairs with C via 3 H-bonds (DNA)
What each symbol means
| Symbol | What it stands for |
|---|---|
| A,T,G,C | Purines A,G; pyrimidines C,T in DNA |
When to use this
Double helix antiparallel strands; complementary sequences. RNA uses U instead of T (A–U, G–C).