资源描述：
《第4章练习题参考答案_免费下载^》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、Chapter4.Aminoacidandprotein1.Definitions(1)Isoelectricpoint(2)Ninhydrinreaction(3)Tertiarystructure(4)Motif(5)Chaperone(6)Chromatography(7)α-helix(8)Proteindenaturation(9)Allostericeffect(10)Bohreffect(11)Moleculardisease(12)HbSAns:略2.Mono-ChoicequestionsAns:12345678910CCADCABEBE1112131415
2、1617181920CDCDEEAEAB21222324252627282930BDDBACDBDC31323334353637383940BCADCBDDDC41424344454647484950BECDDCDCDC51525354555657585960CBDBBCEDAD61626364656667686970DACDCDABCB71727374757677787980BDBAEEAACB81828384858687888990AEBDAACBAE919293949596979899100ACBBDADCBA101102103104105106107108109110
3、EBEBADABAD111112113114115116117118119120AEDBCDACBB1121122123124125126127128129130BCCBDACCAD131132133134135136137138139140ABCBAEBCCE141142143144145146147148149150ADBACDDCCE151152153154155ACACB3.True/FalseQuestionsAns:12345678910TFFFTFTFFT11121314151617181920FTTFFTFFTF21222324252627282930TFTF
4、TTTFFT31323334353637383940TFFTFTTFFF414243444546TTTFTT4.MatchingQuestions(1)Ans:1)A,2)D,3)C,4)B(2)Ans:1)C,2)B,3)A,4)D(3)Ans:1)A,2)B,3)D,4)C,5)E(4)Ans:1)D,2)C,3)A,4)B,5)A(5)Ans:1)B,2)C,3)B,4)B,5)C,6)C,7)B,8)C,9)B(6)Ans:1)A,2)E,3)C,4)B,5)D(7)Ans:1)B,2)I,3)H,4)E,5)G,6)C,7)F,8)A(8)Ans:1)C,2)A,3
5、)D,4)B5.ShortAnswerQuestions(1)Ans:Allaminoacidsfoundinnaturallyoccurringproteinshaveanαcarbontowhichareattachedacarboxylicacid,anamine,ahydrogen,andavariablesidechain.AlltheaminoacidsarealsointheLconfiguration.2(2)Ans:ThepIistheisoelectricpoint.ItoccursatacharacteristicpHwhenamoleculehasan
6、equalnumberofpositiveandnegativecharges,ornonetcharge.ForaminoacidswithnonionizableRgroups,pIisthearithmeticmeanofamolecule’stwopKavalues:pI=1/2(pK1+pK2)(3).Ans:ProlineistechnicallynotanaminoacidGlycinecontainsnochiralcarbonatoms(4).Ans:略(5)Ans:Inthepeptide,Val-Met-Ser-Ile-Phe-Arg-Cys-Tyr-L
7、eu,thepolaraminoacidsareSer,Arg,Cys,andTyr;thearomaticaminoacidsarePheandTyr;andthesulfur-containingaminoacidsareMetandCys.(6)Ans:Aminoacidsotherthantheusual20aminoacidsareproducedbymodificationofoneofthecommonaminoacids.Hydroxyprolineandhydroxylysineare
