生化英文答案 2.docx
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生化英文答案 2.docx
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生化英文答案2
Chapter1Proteins
1.Termdefinition
1)Peptidebond
2)pI
3)Motif
4)Domain
5)Chaperon
6)Subunit
7)Proteindenaturation
8)Tertiarystructureofprotein
9)Allostericeffector
10)Cooperatively
2.Fillintheblanks
1)Theelementsinproteinsinclude,,,,.
2)Theaveragenitrogencontentinproteinsis.Thenitrogencontentcanbeusedtocalculateproteincontentthroughtheequation.
3)Thebasicunitofproteinis,onlyarefoundinproteins.
4)Theofaminoacidsinapolypeptideisnamedastheprimarystructure,bondistheforcethatformstheprimarystructure.
5)Therearethreebasicaminoacids,theyare,twoacidicaminoacidsare,twosulfuraminoacidsare.
6)Theatomsofthepeptidebondandtheadjacenttwocarbonslocateatasamerigidplane,whichiscalled.Itisthebasisofpolypeptide.
7)Biologicalactiveproteinsgenerallyhavestructures.Manyofwhichhavestructures.
3.Multiplechoicequestions(selectonebestanswerforeachquestion)
1)Whichoneofthefollowingbondsstabilizesthesecondarystructureofproteins?
a.saltbond
b.disulfidebond
c.peptidebond
d.hydrophobicinteraction
e.hydrogenbond
2)Thedenaturationofaproteinis:
a.thedestructionoftheprimarystructure
b.therearrangementofaminoacidresidues
c.thedestructionofhigherorderedstructures
d.thechangementofitschemicalproperties
e.thecombinationoftheproteinwithnonproteinfactors
3)Whichoneofthefollowingaminoacidscaninterrupttheα-helix?
a.Ala
b.Pro
c.Met
d.Ser
e.Phe
4)Aboutthedescriptionoftheα-helix,whichoneofthefollowingstatementsistrue?
a.itisaleft-handedhelix
b.thedirectionofthehelixisverticaltotheaxis
c.theaminoacidsidechainsfaceoutward,awayfromthehelixaxis
d.itiscompletelystretchedout
e.itisstabilizedbysaltbonds
5)Abouttheβ-pleatedsheet,whichoneofthefollowingstatementsisfalse?
a.thepeptidechainhasaformofzigzag
b.theaminoacidsidechainsarearrangedalternativelyontheoppositesidesofthepeptidechain
c.thereisnobondsbetweenthepeptidechains
d.theβ-pleatedsheetcouldbeparalleledandantiparalleled
e.thechainiscompletelystretchedout
6)Theaminoacidcontainingahydroxylgroupis
a.Glutamate
b.Phenylalanine
c.Tryptophan
d.Tyrosine
e.Alanine
7)Theaminoacidcontainingasulfhydrylgroupis
a.Ser
b.Cys
c.His
d.Met
e.Thr
8)Theaminoacidcontainingaimidazole(咪唑)groupis
a.Trp
b.Tyr
c.Arg
d.His
e.Phe
9)Theaminoacidwhichdoesnotexistinnaturalproteinsis
a.cysteine
b.citrulline
c.methionine
d.lysine
e.glycine
10)Theaminoacidoccurringatturnstructureofapeptidechainis
a.proline
b.cysteine
c.glutamate
d.methionine
e.alanine
11)Thestructurallevelthatfunctionalproteinshaveatleastis
a.primarystructure
b.secondarystructure
c.tertiarystructure
d.quaternarystructure
e.tolinkwithprostheticgroup
12)Thechemicalbondtomaintainprimarystructureofproteinsis
a.peptidebond
b.hydrogenbond
c.hydrophobicbond
d.saltbond
e.noncovalentbond
13)Whichofthefollowingcanbecalledanoligomericprotein?
a.insulin
b.albumin
c.myoglobin
d.trypsin
e.hemoglobin
14)Whichofthefollowingisnotaconjugatedprotein?
a.albumin
b.dehydrogenase
c.hemoglobin
d.lipoprotein
e.cytochromec
15)WhichpHsolutionofthefollowingdoesserumalbumins(pI=4.7)havepositivechargesin?
a.pH4.0
b.pH4.7
c.pH6.0
d.pH7.0
e.pH8.0
16)Essentialofproteindenaturationis
a.breakofpeptidebonds
b.ruptureofhydrogenbonds
c.breakofsecondarybonds
d.ruptureofdisulfidebonds
e.breakofsaltbonds
17)Whichofthefollowingstatementaccuratelydescribespropertiesofaminoacidsinproteins?
a.Proteinsaremadefromasetof20aminoacidsandaminoacidsnotinthesetareneverfoundinproteins
b.Exceptforglycine,theaminoacidsfoundinproteinsarechiralbecausetheirsidechainscontainacarbonatomwithfourdifferentgroupsattached
c.Allaminoacidshaveoneaminogroupandonecarboxylgroup
d.Anaminogroup,acarboxylgroupandthesidechainareallattachedtothesamecarbonatom,theα-carbon
e.Theα-aminogroupandtheα-carbonareinvolvedinpeptidebondformation
18)Whichoneofthefollowingdescriptionsofaminoacidsandtheirsidechainsinproteinsisaccurate?
a.Arginineandglutamicacidbothcarrycarboxylgroupsontheirsidechains
b.Cysteineistheonlyaminoacidthathasasulphur-containingsidechain
c.Phenylalanineandalaninehavearomatichydrocarbonringsintheirsidechains
d.Lysine,leucineandhistinearetheonlyaminoacidswithsidechainsthatcancarryapositivecharge
e.Glycineistheaminoacidwiththesmallestsidechainandprolinehasasidechainthatformsafive-memberedring,whichincludestheaminonitrogen
19)Polypeptidechainsinproteinshavewhichoneofthefollowingcharacteristics?
They:
a.Areoftenbranched
b.Oftenshowregularityinthesequenceofaminoacidstheycontain
c.Haveanaminoacidsequencethatisknownastheirsecondarystructure
d.Haveanaminoacidsequencethatmakeeachproteinunique
e.Havetwoendsthatareidentical
20)Identifythesinglecorrectstatementconcerningthevaryinglevelsofstructurefoundinproteins.
a.Thesecondaryandtertiarystructuresofaproteindependonitsaminoacidsequence
b.Thesecondarystructureofaproteinisthethree-dimensionalconfigurationofalltheaminoacidsinthesequence
c.Thetertiarystructureofaproteinisthethree-dimensionalconfigurationofaminoacidsclosetogetherinthesequence
d.Theprimary,secondaryandtertiarystructuresofaproteinaredestroyedwhentheproteinisdenatured
e.Proteinsecondarystructuresarestabilizedbydisulfidebonds
21)Selecttheoptionthatcorrectlydescribesproteinsubunitsanddomains.
a.Themoleculesofmanyproteinscontaintwoormoreseparatepolypeptidechains
b.Somelongpolypeptidechainsformtwoormorefoldingsubunitsseparatedbyflexiblesections
c.Separatepolypeptidechainswithinaproteinareknownasdomains
d.Subunitsinaproteinarealwaysidentical
e.Multiplepolypeptidechainsinaproteinareneverlinkedbycovalentbonds
22)Theaminoacidresiduehavinganiminosidechainis:
a.Lysine
b.Histidine
c.Tyrosine
d.Proline
23)Thestructuralproteinsareinvolvedinmaintainingtheshapeofacellorintheformationofmatricesinthebody.Theshapeoftheseproteinsis:
a.Globular
b.Fibrous
c.Stretchofbeads
d.Planar
24)AnalkalineisaddedintoanaminoacidsolutionandmakesthepHto8,theaminoacidisturnedtocathode,sowhatisthepIvalueofthisaminoacid?
a.8
b.9.7
c.10
d.8.5
e.7
25)Whichoneofthefollowingdescriptionsaboutthequaternarystructureofproteiniscorrect?
a.Thequaternarystructureisstabilizedbydisulfidebonds
b.Duringdenaturation,thequaternarystructureisnotnecessarilydestructed
c.Thesubunitsarepolymerizedthroughnon-covalentbonds
d.Thequaternarystructureisnecessaryforproteinbioactivity
e.Allproteinshavethequaternarystructure
26)WhatisthedifferenceofnormalhumanHbAandthesicklecellanemiapatient’sHbS?
a.thenumberofsubunitsisdifferent
b.theprimarystructureofeachsubunitisdifferent
c.thesixthaminoacidresidueattheNterminusofβsubunitisdifferent
d.thesixthaminoacidresidueattheNterminusofαsubunitisdifferent
e.alloftheaboveallcorrect
27)Therandomcoilisastructureof
a.secondarystructure
b.tertiarystructure
c.quaternarystructure
d.domain
e.noneoftheabove
28)Thefalsedescriptionaboutthepeptidebondis:
a.Peptidebondisaconceptofprimarystructure
b.ThefouratomsattachedtotheC-Nbondarelocatedatthesameplane
c.Peptidebondhasthepartialpropertiesofadoublebond
d.rotationofthepeptidebondformsβ-pleatedsheet
e.TheC-NbondisshorterthantheN-Cαbond
29)Thefalsedescriptionaboutthetertiarystructureofproteinsis:
a.allthepeptideswithtertiarystructurehavebiologicalactivities
b.thehydrophilicgroupsusuallylocatedatthesurfaceoftertiarystructure
c.thetertiarystructureisstabilizedbysecondarybonds
d.thetertiarystructureisthespatialstructureofmonomericproteinsorsubunits
e.thetertiarystructureistheresultoflimitationofrotationofdifferentsinglebonds
30)Thefactorthatstabilizedaproteinsolutionis
a.thehighviscosityofaproteinsolution
b.thehydrophobicgroupsonthesurfaceofproteinsrepeleachother
c.therearehydrationshellsonthesurfaceofproteins
d.proteinsolutionisatruesolution
e.noneoftheabove
4.Multiplechoicequestions(selecttwoormorecorrectanswersforeachquestion)
1)Prolineis
a.animinoacid
b.abasicaminoacid
c.aHydrophilicaminoacids
d.ahydrophobicaminoacid
e.noneoftheabove
2)Theaminoacidsthathaveabsorptionpeakat280nmare
a.His
b.Tyr
c.Trp
d.Phe
e.Pro
3)Thecorrectdescriptionaboutα-helixis
a.Itisaright-handedhelix
b.Thepeptidewindsaroundhelixaxis
c.Ithasthepitchof0.54nm
d.Itisstabilizedbypeptidebond
e.Itisaleft-handedhelix
4)Thespatialstructureofproteinsinclude
a.β-pleatedsheet
b.domain
c.subunit
d.motif
e.peptidebond
5)Molecularchaperone
a.facilitatesfoldingofnewlysynthesizedpeptides
b.preventsincorrectfoldingofnewlysynthesizedpeptides
c.hasapivotalrollincorrectformationofdisulfidebonds
d.isthecomponentoftargetproteins
e.heatshockproteinfam
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