A-LevelBiologyNucleic acids and protein synthesis9700/12 · Oct/Nov 2016 · Q221 Mark
Which row represents the correct features of the nitrogenous base cytosine? key: ✓ = true, X = false
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Ahas a single ring structure: ✓, is a purine: X, joins its complementary base by three hydrogen bonds: X
Bhas a single ring structure: ✓, is a purine: X, joins its complementary base by three hydrogen bonds: ✓
Chas a single ring structure: X, is a purine: X, joins its complementary base by three hydrogen bonds: X
Dhas a single ring structure: X, is a purine: X, joins its complementary base by three hydrogen bonds: ✓
✓ Correct answer
B: has a single ring structure: ✓, is a purine: X, joins its complementary base by three hydrogen bonds: ✓
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