Which statements about complementary base pairing are correct?
1 Cytosine forms two hydrogen bonds with guanine.
2 Purines and pyrimidines are different sizes.
3 Adenine forms the same number of hydrogen bonds with thymine and uracil.
4 The base pairs are of equal length.
1 )
1, 2 and 3 only
2 )
1, 2 and 4 only
3 )
1, 3 and 4 only
2, 3 and 4 only
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