Transport: move materials across the membrane
Enzyme: catalyze a reaction at membrane surface
Signal/Receptor, Triggering signals: sit on exterior until something interesting comes by and lunges at it, causes biochemical cascade → chain of reaction (guards reacting at intruder/passerby)
Attachment & Recognition/ Anchor: attachment point for cytoskeleton of other cells or recognition of chemical environment, blood recognizers
Integral: impeded in bi-layer, has hydrophobic region to interact w interior of bi-layer, transmembrane (mostly)
Peripheral: do not interact w hydrophobic part of bi-layer, held to surface by non-covalent bonds. Ex: microtubules, microfilaments & intermediate filaments.
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Bacterial infection in the lungs: typical symptom of cystic fibrosis
How thick is the lipid bilayer: 10nm