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IB Biology HL C2.1.2 Hl Quorum Sensing in Bacteria Questions

Trace how secreted autoinducers build up as bacterial populations grow, cross a threshold and trigger responses such as biofilm formation or Vibrio fischeri bioluminescence.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Define quorum sensing as population-density-dependent bacterial communication and behaviour.
  • Explain how secreted signalling molecules or autoinducers accumulate to a threshold and activate coordinated responses.
  • Use Vibrio fischeri bioluminescence, biofilm formation and bacterial-density data as examples of quorum sensing.

IB Biology HL C2.1.2 Hl Quorum Sensing in Bacteria Questions question 1

[Maximum number: 2]

State, giving one specific example, how individual bacteria change their characteristics when they form aggregates.

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