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IB Biology HL 1.2.6 DNA Double Helix Question Bank

Practise IB Biology HL 1.2.6 by interpreting diffraction evidence and analysing antiparallel strands, backbone links and base pairs.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Interpret X-ray diffraction evidence and connect the helical pattern to DNA structure.
  • Analyse antiparallel strands, phosphodiester links and hydrogen-bonded complementary pairs.
  • Use base pairing and strand direction to infer missing bases or nucleotide relationships.

A1.2.6—DNA as a double helix question 1

[Maximum number: 5]

Draw a labelled diagram of the molecular structure of DNA, comprising of four nucleotides.

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