Label mobile lipids and embedded proteins in a fluid mosaic membrane, then use freeze-etching and model evidence to distinguish it from the sandwich model in IB Biology SL B2.1.10.
Draw a labelled diagram to show the molecular structure of a membrane.
Award [1] for each of the following clearly drawn and correctly labelled:
Phospholipid bilayer;
double row of opposing phospholipids, tails to inside.
Hydrophilic/phosphate/polar heads and hydrophobic/hydrocarbon/fatty acid/non-polar tails labelled.
Integral protein;
embedded in the phospholipid bilayer.
Protein channel/channel protein;
integral protein showing clear channel/pore.
Peripheral protein;
shown on surface or slightly embedded on either side.
Glycoprotein;
with carbohydrate attached on outer side.
Cholesterol;
shown embedded in bilayer and smaller than the hydrophobic tail.
A verified official answer image is still needed because this answer requires diagram/spatial placement.
Preserve all accept/do not accept/award/max/both-needed guidance from the official markscheme.