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IB Biology HL D1.1.8 Hl Functions in Replication Questions

Explore primer synthesis, polymerase extension or replacement and ligase joining of Okazaki fragments in IB Biology HL D1.1.8.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how primase starts replication with an RNA primer and DNA polymerase III extends the new strand with nucleotides.
  • Explain how DNA polymerase I removes RNA primers and replaces them with DNA.
  • Explain how DNA ligase joins Okazaki fragments by sealing breaks in the sugar-phosphate backbone.

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Study D1.1.8 (HL)—Functions in replication conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D1.1.8 Hl Functions in Replication Questions question 1

[Maximum number: 2]

Question (a)

(a)

Explain the role of the following enzymes in DNA replication.

[ 2 ]

Question (i)

(i)

Explain the role of DNA polymerase III in DNA replication.

[ 1 ]

Question (ii)

(ii)

Explain the role of RNA primase in DNA replication.

[ 1 ]
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