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IB Biology HL 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 HL
Level
HL

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 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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