Which of the purines and pyrimidines are capable of forming base pairs with eachother?

Which of the purines and pyrimidines are capable of forming base pairs with eachother?Which of the purines and pyrimidines are capable of forming base pairs with eachother? How are these base pairs involved in the structure of DNA?

Asst Prof
Adenine <> Thymine (with 3 hydrogen bonds)
Adenine <> Uracil (in RNA) (with 3 hydrogen bonds)
Guanine <> Cytosine (with 2 hydrogen bonds)

(The first of each pair is the purine)

The hydrogen bonding between these form the "rungs" of the DNA "ladder." Because each pair (in DNA) is made up of one purine and one pyrimidine, the diameter of the helix is kept constant.

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