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IB Biology SL 1.2.6 DNA Double Helix Question Bank

Practise IB Biology SL 1.2.6 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

  • Label antiparallel sugar–phosphate strands, bases and hydrogen bonds in DNA diagrams.
  • Explain how covalent backbone links and hydrogen bonds stabilize the double helix.
  • Use A–T and C–G pairing to complete or check a short DNA sequence.

A1.2.6—DNA as a double helix 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 A1.2.6—DNA as a double helix question 1 — IB Biology SL
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