Which statements are correct?
1 Adenine and cytosine are both purines.
2 The DNA nucleotide containing adenine is different from the RNA nucleotide containing adenine.
3 Purines only form base pairs with pyrimidines.
1 )
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
2 and 3 only
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