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IB Biology HL A1.2.8 Complementary Base Pairing Questions

Practise IB Biology HL A1.2.8 by deducing unknown bases and bonds, then linking complementary pairing to accurate genetic copying.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Deduce an unknown DNA base from the complementary A–T or G–C partner shown in a representation.
  • Identify hydrogen bonds as the bonds joining complementary DNA bases.
  • Explain that complementary pairing enables accurate replication, transcription and translation.

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Study A1.2.8—Complementary base pairing conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A1.2.8 Complementary Base Pairing Questions question 1

[Maximum number: 1]

The diagram shows a nucleic acid, with some of the bases indicated.

Figure for Question IB Biology HL A1.2.8 Complementary Base Pairing Questions question 1 — IB Biology HL

Deduce the base indicated by X on the diagram.

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