5.2. A summary of membrane function 1)compartmentalization 2) not only providing a selectively permeable barrier to allow regulated exchange of substances between compartments but transporting solutes by membrane protein carriers between compartments or inside and outside of cells 3)responding to external signals signal transudation, receptor, signal amplification, and as a Source of messenger molecules 4) cell junction and mediating intercellular interaction 5)locus of the biochemical activities, providing a scaffolds to organIze enzymes for effective interactions 6) The transudation and store of energy: photosynthetic energy and convert chemical energy to aTP and solute 7)miscellaneous5.2. A summary of membrane function 1) compartmentalization 2) not only providing a selectively permeable barrier to allow regulated exchange of substances between compartments but transporting solutes by membrane protein carriers between compartments or inside and outside of cells 3) responding to external signals signal transudation, receptor, signal amplification, and as a source of messenger molecules 4) cell junction and mediating intercellular interaction 5) locus of the biochemical activities, providing a scaffolds to organize enzymes for effective interactions 6) The transudation and store of energy: photosynthetic energy and convert chemical energy to ATP and solute 7) miscellaneous