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IB Biology HL A2.3.4 Hl Lysogenic Cycle Questions

In the lysogenic cycle, lambda phage DNA integrates into the E. coli chromosome as a prophage and replicates with the host genome during binary fission. Stress can trigger prophage excision and entry into the lytic cycle.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Describe lambda phage DNA integrating into the E. coli chromosome as a prophage.
  • Explain how prophage DNA replicates with the host genome during binary fission.
  • Explain how stress can induce prophage excision and entry into the lytic cycle.

IB Biology HL A2.3.4 Hl Lysogenic Cycle Questions question 1

[Maximum number: 3]

The diagram shows the structure of a bacteriophage lambda virus.

Unlabelled bacteriophage diagram with a faceted polygonal head, a long ringed tail and several angled fibres extending from its base.

Explain how the bacteriophage lambda reproduces in the lysogenic cycle.

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