IB Biology HL C2.1.2 Hl Quorum Sensing in Bacteria Questions
Practise IB Biology HL 2.1.2 by applying quorum sensing in bacteria concepts to exam questions.
- 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.
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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.
F2. (a) a. example;
b. change;
e.g.:
a. Vibrio fischeri;
b. emit light when part of high density population/high concentration of regulatory substance;
Marking guidance:
Accept other verifiable example.
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