9. Diffusion through a membrane SOLUTE moves DOWN concentration gradient (HIGH concentration to LOW concentration) Cell membrane
Notas do Editor
FLUID - because individual phospholipids and proteins can move side-to-side within the layer, like it’s a liquid. MOSAIC - because of the pattern produced by the scattered protein molecules when the membrane is viewed from above .
1. Transport proteins - transport of materials across membrane (some materials are too large or will not freely pass through the phospholipid bilayer) 2. Receptor proteins - communication between cells (receive chemical signals)