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

Describe DNA as a double helix of two antiparallel polynucleotide strands. Explain complementary A–T and G–C pairing by hydrogen bonds, and draw each base attached to a sugar rather than a phosphate.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Describe DNA as a double helix formed by two antiparallel polynucleotide strands.
  • Explain complementary base pairing by hydrogen bonds: A–T and G–C.
  • Draw DNA bases attached to sugars rather than to phosphate groups.

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.

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