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Study questions with answers - Topic 2 2014.pdf

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Department
Biology
Course
BIO1140
Professor
Doug Johnson
Semester
Winter

Description
Studyquestions2013Topic2CellmembranesMultiplechoicequestions1markperanswer1 AbacteriumissuddenlyexpelledfromawarmhumanintestineintocoldwaterWhichofthefollowingadjustmentsmightthebacteriummaketomaintainthesamelevelofmembranefluiditya Increasethelengthofthehydrocarbontailsinitsmembranephospholipidsb Increasetheproportionofunsaturatedhydrocarbontailsinitsmembranephospholipidsc Increasetheamountofcholesterolinthemembraned Increasetheproportionofhydrocarbontailswithnodoublebondsinitsmembranephospholipidsmaintainthee Bothbandcwouldbeappropriateresponsesforthebacteriumtomaketosamelevelofmembranefluidityfollowingthechangeinenvironment2 Theplasmamembraneofananimalcellissymmetricwithrespecttoa Thedistributionofdifferentphospholipidsineachleafletofthelipidbilayerb Theorientationofmembraneproteinsinthelipidbilayerc Thedistributionofcholesterolineachhalfofthelipidbilayerd ThedistributionofGPIlinkedproteinsineachleafletofthelipidbilayere Alloftheabove3 YouarecharacterizinganisolatedmembraneproteinTheproteinisexposedonbothsidesofthemuchofthecentrepartofitssurfacetherearehydrophobicaminoacidswhilemembraneOvertheendsarehydrophilicItcrossesthemembraneanumberoftimesThereisanopeninginthecentreofthisproteinthatislinedbyhydrophilicaminoacidsWhichofthefollowingstatementsproteinanditsfunctionbestdescribesthisa Itisaperipheralmembraneproteinthatservestostabilizethestructureofthemembraneb ItisamultipasstransmembraneproteinofthePtypeactivetransportpumpsc Itisalipidanchoredproteinthatfunctionsasareceptord Itisanintegralproteinthatservesasahydrophilicchannelforthepassageofchargedmoleculese Noneofabcordadequatelydescribestheprotein4 Thelipidbilayernatureoftheplasmamembranewaspostulatedbya SingerNicolsonb WatsonCrickc FryeEdidind GorterGrendele SchleidenSchwann
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