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1、蛋白质合成习题（Exercisesinproteinsynthesis）Biochemicaltestquestionslibraryanditsanswer--proteinbiosynthesisFirst,multiple-choicequestions1.thefollowingstatementsaboutmRAN,thecorrectoneis()AandmRNAarethefinalproductsofgeneexpressionThereadingdirectionofBandmR
2、NAgeneticcodeis3'-5'ThereadingdirectionofCandmRNAgeneticcodeis3'-5'D,mRNAcodonsandtRNAcodonsarepairedbyA-TandG-CpairsEhas3terminationcodonsforeachmoleculemRNA2.thefollowingcountercodonscanbepairedwiththecodonUACA,AUGB,AUIC,ACUD,GUA3.inthefollowingcodo
3、ns,thestopcodonis()A,UUAB,UGAC,UGUD,UAU4.amongthefollowingcodons,thestartingcodonis()A,AUGB,AUUC,AUCD,GAG5.thefollowingdescriptionofthecodon,thewrongoneis()AandcodonreadingareBwithspecificstartsitesandcodonswithoutinterruptionofreadingBothCandcodonsha
4、vedegenerateD,andcodonsareuniversaltothebiologicalcommunityTheinappropriateiteminthe6.codonvariationis()ThecodonspecificityofcodonthirdinAandcodonissmall,socodonspecificityiscompletelydeterminedbythefirsttwoIftherearemutationsinBandthirdbases,suchasAG
5、,CU,becauseofthedegeneracyandvariationofcodonsItcanalsotranslatethecorrectaminoacids,sothatthebiologicalfunctionsofproteinsremainunchangedCandhypoxanthineoftenappearintheanticodonthird,whichhasmoreextensivereadingability(I-U,I-C,I-A)canreducetheerrorc
6、ausedbypointmutationD,almostcodonavailableorthatitsmeaningisthemainreasonofcodonspecificityoftwoBasedetermination7.aninappropriatedescriptionofribosomeis()Aandribosomearemultipleenzymecomplexesthatcanbecoordinatedbyactivitiesofmultipleenzymestocomplet
7、etranslationBandribosomeenzymeshavethesamefunctionwhentheyexistalone(depolymerization)C,ribosomallargesubunit(P)existonthepeptidylsiteandaminoacylsite(A)D,inthelargeribosomalsubunitcontainspeptidyltransferaseandwithvariousinitiationfactors,elongationf
8、actor,releasefromThesitewheretheenzymeiscombinedwithavarietyofenzymesWhichisinappropriateinthenarrativeof8.tRNA?AminoacidstransportedbyAandtRNAduringproteinsynthesisBandinitiationtRNAareusedonlyineukaryoticprokaryotesfortheinitiationofproteins
