May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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23Dna Structure ReplicationMedium1 mark
Which row is correct for guanine? key ✓ = correct ✗ = not correct
has a double ring structureis a purinehas three hydrogen bonds between guanine and its complementary base
A✓✓✓
B✓✗✓
C✗✓✗
D✗✗✓