Which statements about complementary base pairing are correct?
1) Cytosine forms three hydrogen bonds with guanine.
2) Purines and pyrimidines are different sizes.
3) It allows transcription to occur.
4) The base pairs are of different lengths.
1, 2 and 3
2 )
1, 2 and 4
3 )
1, 3 and 4
4 )
2, 3 and 4
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