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IB Biology HL A1.2.6 Dna As a Double Helix Questions

Practise IB Biology HL A1.2.6 by interpreting diffraction evidence and analysing antiparallel strands, backbone links and complementary base pairs.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Interpret X-ray diffraction evidence as support for the helical structure of DNA.
  • Describe antiparallel DNA sugar-phosphate backbones with complementary A–T and G–C base pairs joined by hydrogen bonds.
  • Use complementary A–T and G–C pairing to complete or check a DNA double-helix representation.

Learn this topic

Study A1.2.6—DNA as a double helix conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A1.2.6 Dna As a Double Helix Questions question 1

[Maximum number: 5]

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

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