IB Biology SL B2.1.8 Selectivity in Permeability Questions

Use small, non-polar gases and sugars to match molecule properties and concentration gradients to direct or protein-mediated membrane routes.

Exam points

Compare simple and facilitated diffusion by solute polarity/size and need for a membrane protein.
Distinguish active transport from passive routes: it uses ATP to move molecules against a concentration gradient.
Use molecule-route tables to pair oestradiol with the bilayer and reject mismatched protein routes.

[Maximum number: 1]

Which molecule is paired with the component of the cell membrane that allows it to pass through the membrane?

Molecule

Component of the
cell membrane

insulin

aquaporin

glycogen

channel protein

oestradiol

phospholipid bilayer

carbon dioxide

pump protein

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