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27 - 190 Which aspect of phospholipids is most importantto...

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Unformatted text preview: 190} Which aspect of phospholipids is most importantto the formation of bilayers"? A} Their hydro-carbon tailscan consist of fatty aeidsor isoprene subunits. B] They arearnphipathic. G} Their size is small. relative to fats. D} Their size is large. relativeto cholesterol. 191} Which of the following increasesthe strength of the hydrophobic interactions in lipid bilayers and thus makesthem less permeable to polar molecules? A} increasing length of the hyd roost bon chains B] removing cholesterol G} the presenoeof double bonds D} increasing temperature 192} Why do lipid bilayersform spontaneously? A} The process is endergonic. B} The process leads to a huge decrease in entropy and no change in potential energy. G} The process is endothermic. D] The process is exergonic. 193} Which of the following crosses lipid bilayersthe fastest? A} a small. polar molecule like water B} alarge. polar molecule like glucose 0} a small. nonpolar molecule like oxygen {02] D} a sodium ion 194} Which of thefollowingcrosses lipid bilayers the slowest? A} a small. nonpolar molecule like oxygen {02] B} a sodium ion 01a small. polar molecule like water D] alarge. polar molecule like glucose 195} Why does cholesterol lower membrane permeability? A} It paticipates in hydrogen bonding in the membrane interior. B} It is small relative to most phospholipid s. C} It fills gaps in membranes and increases hydrophobic interaztions. D} It is polar. 196} You have just discovered an organism that lives in extremely cold environments. Which ot the following would you predict to be true about the phospholipids in its membranes. compared to phosp holipids in the membranesot organismsthat live in warmer environments? A} The membrane phospholipidsof oold—adapted organisms will have more saturated hydrocarbon tails. B} The membrane phospholipidsol cold-adapted organismswill have more unsaturated hydrocarbon tails. G} The membrane phospholipidsof oold-adapted organisms will have longer hydrocarbon tails. 2? 199} 191} 192} 19:1} 194} 199} 19a} ...
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