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D1.1.8 (HL)—Functions in replication

Functions in replication explains how DNA is copied, checked, amplified or analysed through specific strand relationships, enzymes and molecular techniques.

Syllabus
First assessment 2025
Objective
D1.1.8
Level
HL

Exam analysis

Chance of appearing12%of analysed past papers
Latest appearanceMay 2024
Most common paperPaper1
Typical marks1–3

Common command terms

  • Identify
  • Explain
  • Outline
  • Describe

Scoring notes

Common mistake
Saying helicase forms new strands instead of unwinding DNA and breaking hydrogen bonds.

Recent exam appearances

May 2024Paper1 ["HL"] · TZ127[ 1 ]D1.1.8 (HL)—Functions in replication
November 2023Paper1 ["HL"] · TZ221[ 1 ]D1.1.8 (HL)—Functions in replication
November 2022Paper1 ["HL"] · TZ027[ 1 ]D1.1.8 (HL)—Functions in replication
May 2022Paper2 ["HL"] · TZ27(b)[ 3 ]D1.1.8 (HL)—Functions in replication
May 2021Paper2 ["HL"] · TZ27(b)[ 3 ]D1.1.8 (HL)—Functions in replication
Practice this objective

Coverage 2013–2024 · Updated 16 Jul 2026

Concept essentials

  • Functions in replication depends on matching each strand, enzyme or laboratory step to its exact function.
  • Template strands and complementary base pairing give functions in replication its copying accuracy.
  • Functions in replication is clearer when amplification, separation and profiling are not confused.
  • Molecular evidence for functions in replication must be interpreted from bands, isotopes, primers or enzyme roles.
ConceptIB Biology HL