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 as it does with uracil.
4) The base pairs in a molecule of DNA are of equal length and equal width.
1 )
1, 2 and 3
2 )
1, 2 and 4
3 )
1, 3 and 4
2, 3 and 4
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