May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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23Dna Structure ReplicationMedium1 mark
The diagram shows part of a polynucleotide.
Diagram of part of a polynucleotide showing three linked nucleotides running top to bottom, each a phosphate (open circle) joined to a pentose (shaded pentagon) joined to a base: the top base is drawn as a single ring, the middle and bottom bases are each drawn as two fused rings.
What is a possible base sequence shown in the diagram?