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

Practise IB Biology SL A1.2.6 by interpreting DNA diagrams, complementary base pairs and the covalent and hydrogen bonds of the double helix.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Draw and label two antiparallel DNA sugar-phosphate strands, with bases attached to sugars and at least four nucleotides shown.
  • Explain that hydrogen bonds join complementary A–T and G–C base pairs to stabilize the DNA double helix.
  • Interpret X-ray diffraction or Watson–Crick model evidence as support for a helical DNA structure.

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 SL A1.2.6 Dna As a Double Helix Questions question 1

[Maximum number: 3]

Draw a labelled diagram to show how four nucleotides are joined together to form a double-stranded DNA molecule with two base pairs.

Figure for Question IB Biology SL A1.2.6 Dna As a Double Helix Questions question 1 — IB Biology SL
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