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IB Biology HL C3.1.1 System Integration Questions

IB Biology HL C3.1.1 explores how interacting parts coordinate biological systems. Biofilms illustrate emergent properties, quorum sensing and collective resistance.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain emergent properties as system-level features that arise through interactions among components and are not present in individual parts.
  • Use biofilm evidence to explain how features such as EPS, quorum sensing, high cell density or slow growth help communities survive and resist treatment.

IB Biology HL C3.1.1 System Integration Questions question 1

[Maximum number: 1]

A computer model simulation was proposed to assess the removal of extracellular polymeric substances (EPS) from biofilms by using a detachment-promoting agent (DPA).

Simulations on a 60-day-old biofilm after 6 minutes of treatment with DPA and on the same biofilm after 84 minutes of treatment with DPA are shown as a 3D view and a cross section. Dark grey represents bacteria and light grey shows the EPS.

Figure for Question IB Biology HL C3.1.1 System Integration Questions question 1 — IB Biology HL

State one reason, other than the formation of an EPS, for the high resistance to antimicrobial agents in biofilm microorganisms.

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