This 60-minute IB DP Biology lesson is for SL and HL students. Students draw an accurate two-dimensional fluid mosaic model and explain the distinct bases of physical permeability, protein selectivity and extracellular carbohydrate recognition or adhesion.

The teacher walkthrough includes preparation, questions, expected responses, support, extension and an independent exit task.

Included: editable Word and PDF versions of the teacher walkthrough, student activity pack and separate answer key (six documents), plus supporting classroom figures.

Topic coverage: B2.1.8 + B2.1.9 + B2.1.10.

Single-teacher classroom licence. Independently authored by The Science Shop; customer-file integrity and packaging audited.