Which statements about complementary base pairing are correct?
1) Purines and pyrimidines are different sizes.
2) It occurs during translation.
3) The base pairs are of different length.
4) Uracil forms two hydrogen bonds with adenine.
1 )
1, 2 and 3 only
1, 2 and 4 only
3 )
1, 3 and 4 only
4 )
2, 3 and 4 only
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