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IB Biology HL A2.3.4 Hl Lysogenic Cycle Questions

Practise IB Biology HL A2.3.4 by explaining how bacteriophage lambda DNA integrates into a host genome and remains latent during lysogeny.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how bacteriophage lambda attaches to a host cell and integrates its DNA into the E. coli chromosome as a prophage.
  • Explain how prophage DNA is replicated with the host genome during binary fission so daughter cells inherit the viral DNA.
  • Explain how stress can induce prophage excision and entry into the lytic cycle.

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Study A2.3.4 (HL)—Lysogenic cycle conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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.

Figure for Question IB Biology HL A2.3.4 Hl Lysogenic Cycle Questions question 1 — IB Biology HL

Explain how the bacteriophage lambda reproduces in the lysogenic cycle.

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