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IB Biology HL B2.1.2 Bilayers As Barriers Questions

Analyse how hydrophobic fatty-acid tails create a low-permeability core, separate aqueous compartments and require protein routes for controlled entry and exit in IB Biology HL…

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

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.

IB Biology HL B2.1.2 Bilayers As Barriers Questions question 1

[Maximum number: 1]

Neural pathways in living brains can now be mapped by tracking the movement of water molecules inside axons. What keeps water molecules inside axons?

A

Plasma membrane

B

Hydrogen bonding

C

Pump proteins

D

Synapse

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