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IB Biology SL 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 SL
Level
SL

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 SL A1.2.8 Complementary Base Pairing Questions question 1

[Maximum number: 1]

The following diagram shows a short stretch of DNA. What bases are indicated by labels Y and Z ?

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

Y

Z

thymine

adenine

thymine

guanine

uracil

guanine

uracil

adenine

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