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IB Biology SL B2.1.2 Bilayers As Barriers Questions

Explain how the hydrophobic bilayer core separates aqueous compartments and limits ion or hydrophilic-molecule diffusion while proteins control membrane entry and exit in IB…

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain why the hydrophobic fatty-acid core restricts diffusion of ions and large or hydrophilic molecules across a phospholipid bilayer.
  • Use membrane examples to explain how bilayers separate aqueous compartments while protein-mediated routes control entry and exit.

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Study B2.1.2—Bilayers as barriers conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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