Which statement correctly describes the base pairing in a molecule of DNA?
The purine adenine forms bonds with the pyrimidine thymine.
2 )
The purine adenine forms bonds with the pyrimidine uracil.
3 )
The purine cytosine forms bonds with the pyrimidine guanine.
4 )
The purine guanine forms bonds with the pyrimidine thymine.
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