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IB Biology HL D1.1.7 Hl Leading Vs Lagging Strand Questions

Explore Okazaki fragments, repeated RNA primers and replication-fork direction in IB Biology HL D1.1.7.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Distinguish continuous leading-strand synthesis from discontinuous lagging-strand synthesis at a replication fork.
  • Identify Okazaki fragments and repeated RNA primers on the lagging strand when interpreting replication-fork diagrams.

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Study D1.1.7 (HL)—Leading vs. lagging strand conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D1.1.7 Hl Leading Vs Lagging Strand Questions question 1

[Maximum number: 1]

What is a difference between the leading and lagging strands in DNA replication?

A

Fewer Okazaki fragments are produced on the leading strand.

B

Exons are only produced on the lagging strand.

C

More RNA primers are assembled on the lagging strand.

D

DNA nucleotides are linked 5′5^{\prime} to 3′3^{\prime} on the leading strand and 3′3^{\prime} to 5′5^{\prime} on the lagging strand.

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