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SCAN0004 - 1 2 3(f(L Functions of Bacterial Cell Envelo e...

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Unformatted text preview: 1) 2) 3) (f (L Functions of Bacterial Cell Envelo e 77 /\/Ldk peptidoglx‘tan lmég/ Osmotic barrier - helps cell resist lysrs caused by changes in solute concentration — osmotic pressure = 2 atm (car-tire) Maintain Cell Sha e /|ncreases tensile strength at ‘. " ' certain locations on cell surface. l " |:> _— van/(m5[peplldoglttcwfl lb (Lt/Wrap 5MB!” Protect cytoplasm from extracellular chemical agents: Gram(+) _(_)Gram ' — thick peptidoglycan layer that is —thin peptidoglycan layer hydrophilic (amino sugars, charged aa’s & p043-) - Problem: hydrophobics may enter more readily - excludes hydrophobics, - Answer: 2nd membrane! ,/ 1/ . f Vt paw rmzrmi' rib magmatic 5whilm‘xzrz; permeable to hydrophilics - outer leaflet — LPS (excludes hydrophobics) - lipid bilayer excludes hydrophilics ' lnner leaflet = 2nd phospholipid bilayer excludes hydrophilics QED [Wangw'l—rxrégtewg agmgmgwlwwm in all?“ FMLQ 5;“le ml; 66 ...
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