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26 - 133 If you mechanically shook amixture of amphipathic...

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Unformatted text preview: 133} If you mechanically shook amixture of amphipathic lipids and water. what would you expect to seewhen the solution is observed with an electron microscope? A] The lipids will hayeformed tinyI vesicles filled with water. B] The lipids and water will have separated intotwo distinct layers because the lipids are partially nonpolar. C} The lipids will have completely dissolved in solution becausetheyI are partially polar. D} The lipids will haueformed planar bilayer membranes. 134} What do phospholipids 31d triglycerides have in com mon'? A] They both haveaphosphate. B] They both haveaglyoerol backbone. G} They both have three fatty acid s. D} They both contain serine or some other organic compound. 135} What type of functional group resultswhen thealcohol group on glycerol reacts with the carboxylic acid group on afalty acid? A] peptide bond B] ester G] hydrocarbon D] glycosidic bond 1%} In an experiment involving planar bilayers. asolution of table salt {mdium and chloride ionsin wfler} is added on the left side of the membrane w hile pure water is added on the right side. After 33 minutes the researchers test for the presence of ions on emh side of the mem brane. The right side tests negalive for ions. What can you conclude? A} The water somehow blocked the movement of ions azross the membrane. B] The experiment failed. G} The left side would probably also test negative for ions D} Ions cannot cross planar bilayers. 13?} Which of thefollowing phospholipid membranes would be most permeable to glycerol? A} one with long and saturated fatty-acid tails B} one with short and unsaturated tails C} onewith short and sdurated tails D] one with long and unsaturated tails 135]. Which of thefollowing is the best explanation for why I.regetable oil isaliouid at room temperaiure whileanimal fats are solid? A} Vegetable oil has longer fatty- azid iailsthan animal fats have. B} Animal fats have no amphipathic character. C} Vegetable oil has more double bondsthan animal fats D] Vegetable oil hasfewer double bondsthan animal fats 138} Which of the following isthe best explanation for why cholesterol decrI-Isesthe permeability of biological mem branes? A} Cholesterol has four rings in its structure that can sequester {trap} solutes. B} Because cholesterol is am phipalhic. it formstiny Iu'esicles that trap solutes. C} Cholesterol binds to the outside surface of a mem brsne. thu s blocking the movement of solutes. D} Elecausecholesterol is amphipathic. it fits in between the phosp holipids and blocks diffusion through the membrane. 25 133} 134} 135} 1 es} 137} 1am 1am ...
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