All of the illustrations in the Talking Glossary of Genetics are freely available and may be used without special permission.

The binding of two nucleotides forms a base pair. In DNA, cytosine and guanine are bound together by 3 hydrogen bonds, whereas adenine and thymine are bound by 2 hydrogen bonds. Therefore, the link between cytosine and guanine is much stronger than the link between adenine and thymine.

 
 
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