In the DNA double helix,a purine can only pair with a pyrimidine.

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Quizplus · Accepted Answer

This is true. The four nitrogenous bases in DNA are adenine (A) and guanine (G), which are purines, and cytosine (C) and thymine (T), which are pyrimidines. A purine always pairs with a pyrimidine, with A pairing with T and G pairing with C, due to the specific hydrogen bonding between the bases. This complementary base pairing is essential for the accurate replication and transcription of DNA.

In the DNA Double Helix,a Purine Can Only Pair with a Pyrimidine