DNA double helix 3D model
Type a sequence of A, T, G and C to build the double helix, with the complementary antiparallel strand, the hydrogen bonds counted and a slider to unzip it as in DNA replication.
Learn DNA structure properly
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Questions students ask
Which bases pair in DNA?
Adenine pairs with thymine (two hydrogen bonds) and guanine with cytosine (three hydrogen bonds).
Why are DNA strands antiparallel?
The two sugar-phosphate backbones run in opposite directions, 5′ to 3′ and 3′ to 5′, which lets the bases pair up inside the helix.
Free notes on DNA structure
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