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A1.2.15 (HL)—Chargaff's data

Chargaff’s data showed consistent base-ratio patterns in DNA, supporting complementary base pairing and challenging the tetranucleotide hypothesis in IB Biology exam contexts.

Syllabus
First assessment 2025
Objective
A1.2.15
Level
HL

Concept essentials

  • Chargaff's data should be described using precise molecular vocabulary.
  • Structure and information must be kept separate: backbones provide continuity while bases carry sequence meaning.
  • Exam answers should match the command term and avoid adding unsupported extra claims.
ConceptIB Biology HL