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Is it one, or the other?
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Is this a purine or pyrimidine group?
Purine

Is this a purine or pyrimidine group?
Pyrimidine

Is adenine a purine or pyrimidine base?
purine

Is guanine a purine or pyrimidine base?
purine

Is cytosine a purine or pyrimidine base?
pyrimidine

Is thymine a purine or pyrimidine base?
pyrimidine

Is uracil a purine or pyrimidine base?
pyrimidine