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IB Biology HL C3.1.1 System Integration Questions

Explore how matrix architecture, quorum sensing, growth state and cooperation integrate biofilm components into coordinated resistance and survival in IB Biology HL C3.1.1.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain that emergent properties arise when interacting biological components form an organized system whose behaviour is not present in individual cells or parts.
  • Interpret biofilm evidence to relate matrix architecture, quorum sensing, growth state and cell cooperation to coordinated system-level resistance or survival.

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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