A-LevelBiologyNucleic acids and protein synthesis9700/12 · May/June 2016 · Q191 Mark
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.
A1, 2 and 3
B1, 2 and 4
C1, 3 and 4
D2, 3 and 4
✓ Correct answer
A: 1, 2 and 3
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