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IB Biology HL 1.2.8 Complementary Base Pairing Question Bank

Practise IB Biology HL 1.2.8 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 unknown bases and bond types in DNA diagrams using complementary pairing and strand structure.
  • Explain why complementary pairing supports accurate replication and transcription of genetic information.

A1.2.8—Complementary base pairing question 1

[Maximum number: 2]

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

Figure for Question A1.2.8—Complementary base pairing question 1 — IB Biology HL

Question (a)

(a)

Deduce the base indicated by X on the diagram.

[ 1 ]

Question (b)

(b)

Identify the type of bond indicated by Z on the diagram.

[ 1 ]
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