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bonds are responsible for the chemical affinity between A and T (or G and C)

bonds are responsible for the chemical affinity between A and T (or G and C)
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The bonds which are responsible for the chemical afinity A(Adenine) and T(Thymine) is Hydrogen bond (A hydrogen bond is an attraction between a hydrogen atom and an electronegative atom, with only nitrogen , oxygen  or fluorine.) In the DNA helix, the bases: adenine, cytosine, thymine and guanine are each linked with their complementary base by hydrogen bonding. Adenine pairs with thymine with 2 hydrogen bonds. Guanine pairs with cytosine with 3 hydrogen bonds.

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