2[1]2._membranes

2[1]2._membranes - Biological Sciences 1A (Wheelis) Sample...

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Biological Sciences 1A (Wheelis) Sample Exam—Membranes 1. Which of the following is a NOT a way in which archaeal lipids differ from those of eucaryotes and bacteria? a. the hydrocarbon side chains are branched b. the polar end may bear a phosphate c. hydrocarbons are linked to glycerol via an ether linkage d. all of the above e. none of the above 2. Eucaryotic membranes consist of a. phospholipids b. sterols c. proteins d. carbohydrate e. all of the above 3. Most biological membranes contain a. a phospholipid bilayer b. about 50% protein (by weight) c. steroids or hopanoids to control fluidity d. all of the above e. none of the above 4. Assume that the average molecular weight of an average phospholipid is about 700, and that of the average membrane protein is about 50,000. Calculate the approximate ratio of phospholipid molecules to protein molecules in an average biological membrane? a. 100:1 b. 70:1 c. 50:1 d. 1:1 e. 1:100 5. Unsaturated fatty acids a. have one or more C=C bond b. have kinks in their hydrocarbon chains c. increase the fluidity of membranes into which they are incorporated d. are amphipathic e. all of the above 6. Proteins in eucaryotic membranes a. are often anchored against diffusional movement by attachment to extrinsic
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2[1]2._membranes - Biological Sciences 1A (Wheelis) Sample...

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