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IB Biology HL A1.2.8 Complementary Base Pairing Questions

Identify complementary pairs: A with T in DNA, A with U in RNA, and C with G. Explain how complementary base pairing supports accurate DNA replication and enables transcription and translation in gene expression.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • State the complementary base pairs: A–T in DNA, A–U in RNA, and C–G.
  • Explain how complementary base pairing enables accurate DNA replication, transcription and translation in gene expression.

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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