![Model of a stretch of DNA approximately 12 base pairs in length.](http://static.sciencelearn.org.nz/images/images/000/000/197/full/DNA-double-helix20150908-25061-1acmn9j.jpg?1674163883)
This picture shows a model of a stretch of DNA approximately 12 base pairs in length. In reality, a piece of DNA can be millions of base pairs long.
This picture shows a model of a stretch of DNA approximately 12 base pairs in length. In reality, a piece of DNA can be millions of base pairs long.