A-LevelBiologyNucleic acids and protein synthesis9700/12 · Feb/Mar 2021 · Q221 Mark
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.
A1, 2 and 3
B1, 2 and 4
C1, 3 and 4
D2, 3 and 4
✓ Correct answer
D: 2, 3 and 4
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