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1. WhatthisthNOTthathkeythpropertyththatthenablethproteinsthtothparticipatethinthathwidethrangethofthfunctions?
a. Proteinsthhavethathhighthmolecularthweight.
b. Proteinsthcontainthdifferentthfunctionalthgroups.
c. Somethproteinstharethquitethrigid,thwhereasthothersthdisplaythconsiderablethflexibility.
d. Proteinstharethlinearthpolymersthbuiltthofthdifferentthaminothacids.
e. Proteinsthcanthinteractthwiththonethanotherthandthwiththotherthbiologicalthmacromoleculesthtothformth
complexthassemblies.
ANSWER:t h a
2. Whatthdoesthanthα-aminothacidthconsistthof?
a. carbonylthgroup,thαthcarbon,thaminothgroup,thoxygenthatom,thdistinctivethRthgroup
b. carboxylicthacidthgroup,thαthcarbon,thaminothgroup,thhydrogenthatom,thdistinctivethRthgroup
c. carboxylicthacidthgroup,thεthcarbon,thnitrothgroup,thhydrogenthatom
d. alcoholthgroup,thαthcarbon,thaminothgroup,thnitrogenthatom,thdistinctivethRthgroup,thhydrogenthatom
e. carboxylicthacidthgroup,thδthcarbon,thiminethradical,thhydrogenthatom,thdistinctivethRthgroup
ANSWER:t h b
3. Whatthisomersthofthaminothacidstharethfoundthinthproteinsthandthwhatthabsolutethconfigurationthdoththeythhave?
a. Lth isomer;thRthabsolutethconfiguration
b. Dth andthLth isomers;thRthabsolutethconfiguration
c. Lth isomer;thSthabsolutethconfiguration
d. Dth isomer;thSthabsolutethconfiguration
e. Lth andthDth isomers;thSthabsolutethconfiguration
ANSWER:t h c
4. Inthanthacidicthsolutionth(pHth=th1),thwhatthisththethionizationthstatethofthanthaminothacid?
a. Thethaminothgroupthisthdeprotonated;ththethcarboxylthgroupthisthprotonated.
b. Thethaminothgroupthisthnotthdissociated;ththethcarboxylthgroupthisthnotthdissociated.
c. Thethaminothgroupthisthprotonated;ththethcarboxylthgroupthisthdeprotonated.
d. Thethaminothgroupthisthprotonated;ththethcarboxylthgroupthisthnotthdissociated.
e. Thethaminothgroupthisthdeprotonated;ththethcarboxylthgroupthisthnotthdissociated.
ANSWER:t h d
5. ChooseththethcorrectthgroupsthforthThr,thLys,thHis,thMet,threspectively,thonththethbasisthofthgeneralt
hchemicalthcharacteristics.
a. polarthbutthuncharged;thnegativelythcharged;thpositivelythcharged;thhydrophobic
b. polarthbutthuncharged;thpositivelythcharged;thpositivelythcharged;thhydrophobic
c. positivelythcharged;thhydrophobic;thpolarthbutthnotthcharged;thpositivelythcharged
d. negativelythcharged;thhydrophobic;thpositivelythcharged;thpolarthbutthnotthcharged
e. positivelythcharged;thpositivelythcharged;thpolarthbutthnotthcharged;thnegativelythcharged
ANSWER:t h b
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6. Whichthaminothacidthhasththethone-letterthabbreviationthK?
a. histidine
b. asparagine
c. alanine
d. valine
e. lysine
ANSWER:t h e
7. ChooseththethstatementththatthdoesthNOTthreflectthwhythathparticularthsetthofth20thaminothacidsthbecomesthth
ethbuildingthblockthofthproteins.
a. Otherthpossiblethaminothacidsthmaythhavethsimplythbeenthtoothreactive.
b. Thethringsthinththeirthcyclicthformstharethtoothbig.
c. Theythprovidethproteinsthwithththethversatilitythtothassumethmanythfunctionalthroles.
d. Manythofththesethaminothacidsthwerethprobablythavailablethfromthprebioticthreactions.
e. Asthathset,ththeytharethdiverse.
ANSWER:t h b
8. Thethamidethbondthisthathlinkagethbetweenththe:
a. β-aminothgroupthofthonethaminothacidthandththethα-aminothgroupthofthanotherthaminothacid.
b. β-carboxylthgroupthofthonethaminothacidthandththethβ-aminothgroupthofthanotherthaminothacid.
c. δ-carboxylthgroupthofthonethaminothacidthandththethα-carboxylthgroupthofthanotherthaminothacid.
d. α-aminothgroupthofthonethaminothacidthandththethε-aminothgroupthofthanotherthaminothacid.
e. α-carboxylthgroupthofthonethaminothacidthandththethα-aminothgroupthofthanotherthaminothacid.
ANSWER:t h e
9. Whatthisththethamino-terminalthresiduethandthwhatthisththethcarboxyl-
terminalthresiduethinththethsequencethofthaminothacidsthGly-Tyr-Gly-Phe-Leu?
a. LeucinethisthN-terminalthandthglycinethisthC-terminal.
b. GlycinethisthN-terminalthandthleucinethisthC-terminal.
c. TyrosinethisthN-terminalthandthleucinethisthC-terminal.
d. PhenylalaninethisthN-terminalthandthleucinethisthC-terminal.
e. TheretharethnothN-terminalthandthC-terminalthresiduesthinththethsequencesthofthaminothacids.
ANSWER:t h b
10. Oligopeptidethisthathpolypeptidethchainthmadethof:
a. numerousthaminothacids.
b. aminothacidsthwiththathlowthmolecularthweight.
c. positivelythchargedthaminothacids.
d. smallthnumbersthofthaminothacids.
e. negativelythchargedthaminothacids.
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ANSWER:t h d
11. Athproteinthwiththathmolecularthweightthofth75th550thgthmol–1th hasthathmassthof:
a. 75,550thDathorth755.5thkDa.
b. 7555thDathorth75.55thkDa.
c. 75,550thDathorth75.55thkDa.
d. 755,500thDathorth7.555thkDa.
e. 7,555,000thDathorth75550thkDa.
ANSWER:t h c
12. Knowledgethofththethaminothacidthsequencesthisthimportantthforthseveralthreasons.thWhatthisthNOTthon
ethofththosethreasons?
a. Aminothacidthsequencesthdetermineththeththree-dimensionalthstructuresthofthproteins.
b. Thethsequencethofthathproteinthrevealsthmuchthaboutthitsthevolutionarythhistory.
c. Knowledgethofththethsequencethofthathproteinthcanthhelpthtothpreventthmutations.
d. Changesthinththethaminothacidthsequencethcanthleadthtothabnormalthproteinthfunctioningthandthdisease.
e. Thethsequencethofthathproteinthisthnecessarythtothdeterminethitsthfunction.
ANSWER:t h c
13. Choosethatomsththatthliethinthathplanethinthathpairthofthlinkedthaminothacids.
a. Cα3,thC,thO,thN,thCα2
b. Cα,thC,thN,thH,thCα2
c. Cα,thC,thO,thN,thH,thCα3
d. Cα,thCα2,thCα3,thN,thH,thC
e. Cα,thC,thO,thN,thH,thCα2
ANSWER:t h e
14. WhichthstatementthCORRECTLYthdescribethathpeptidethbond?
a. ThethC–Nthdistancethinthathpeptidethbondthisth1.49thÅ;ththethpeptidethbondthisthpositivelythcharged.
b. ThethC–
Nthdistancethinthathpeptidethbondthisth1.27thÅ;ththethbondthresonatesthbetweenthathsinglethbondthan
dthathdoublethbond;ththethpeptidethbondthisthnegativelythcharged.
c. ThethC–
Nthdistancethinthathpeptidethbondthisth1.32thÅ;ththethbondthresonatesthbetweenthathdoublethbondthandthatht
riplethbond;ththethpeptidethbondthisthathkindthofthdipole.
d. ThethC–
Nthdistancethinthathpeptidethbondthisth1.35thÅ;ththethbondthresonatesthbetweenthathsinglethbondthandthathtr
iplethbond;ththethpeptidethbondthisthathkindthofthdipole.
e. ThethC–
Nthdistancethinthathpeptidethbondthisth1.30thÅ;ththethbondthresonatesthbetweenthathdoublethbondthandthatht
riplethbond;ththethpeptidethbondthisthpositivelythcharged.
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Chapterth2
1. WhatthisthNOTthathkeythpropertyththatthenablethproteinsthtothparticipatethinthathwidethrangethofthfunctions?
a. Proteinsthhavethathhighthmolecularthweight.
b. Proteinsthcontainthdifferentthfunctionalthgroups.
c. Somethproteinstharethquitethrigid,thwhereasthothersthdisplaythconsiderablethflexibility.
d. Proteinstharethlinearthpolymersthbuiltthofthdifferentthaminothacids.
e. Proteinsthcanthinteractthwiththonethanotherthandthwiththotherthbiologicalthmacromoleculesthtothformth
complexthassemblies.
ANSWER:t h a
2. Whatthdoesthanthα-aminothacidthconsistthof?
a. carbonylthgroup,thαthcarbon,thaminothgroup,thoxygenthatom,thdistinctivethRthgroup
b. carboxylicthacidthgroup,thαthcarbon,thaminothgroup,thhydrogenthatom,thdistinctivethRthgroup
c. carboxylicthacidthgroup,thεthcarbon,thnitrothgroup,thhydrogenthatom
d. alcoholthgroup,thαthcarbon,thaminothgroup,thnitrogenthatom,thdistinctivethRthgroup,thhydrogenthatom
e. carboxylicthacidthgroup,thδthcarbon,thiminethradical,thhydrogenthatom,thdistinctivethRthgroup
ANSWER:t h b
3. Whatthisomersthofthaminothacidstharethfoundthinthproteinsthandthwhatthabsolutethconfigurationthdoththeythhave?
a. Lth isomer;thRthabsolutethconfiguration
b. Dth andthLth isomers;thRthabsolutethconfiguration
c. Lth isomer;thSthabsolutethconfiguration
d. Dth isomer;thSthabsolutethconfiguration
e. Lth andthDth isomers;thSthabsolutethconfiguration
ANSWER:t h c
4. Inthanthacidicthsolutionth(pHth=th1),thwhatthisththethionizationthstatethofthanthaminothacid?
a. Thethaminothgroupthisthdeprotonated;ththethcarboxylthgroupthisthprotonated.
b. Thethaminothgroupthisthnotthdissociated;ththethcarboxylthgroupthisthnotthdissociated.
c. Thethaminothgroupthisthprotonated;ththethcarboxylthgroupthisthdeprotonated.
d. Thethaminothgroupthisthprotonated;ththethcarboxylthgroupthisthnotthdissociated.
e. Thethaminothgroupthisthdeprotonated;ththethcarboxylthgroupthisthnotthdissociated.
ANSWER:t h d
5. ChooseththethcorrectthgroupsthforthThr,thLys,thHis,thMet,threspectively,thonththethbasisthofthgeneralt
hchemicalthcharacteristics.
a. polarthbutthuncharged;thnegativelythcharged;thpositivelythcharged;thhydrophobic
b. polarthbutthuncharged;thpositivelythcharged;thpositivelythcharged;thhydrophobic
c. positivelythcharged;thhydrophobic;thpolarthbutthnotthcharged;thpositivelythcharged
d. negativelythcharged;thhydrophobic;thpositivelythcharged;thpolarthbutthnotthcharged
e. positivelythcharged;thpositivelythcharged;thpolarthbutthnotthcharged;thnegativelythcharged
ANSWER:t h b
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6. Whichthaminothacidthhasththethone-letterthabbreviationthK?
a. histidine
b. asparagine
c. alanine
d. valine
e. lysine
ANSWER:t h e
7. ChooseththethstatementththatthdoesthNOTthreflectthwhythathparticularthsetthofth20thaminothacidsthbecomesthth
ethbuildingthblockthofthproteins.
a. Otherthpossiblethaminothacidsthmaythhavethsimplythbeenthtoothreactive.
b. Thethringsthinththeirthcyclicthformstharethtoothbig.
c. Theythprovidethproteinsthwithththethversatilitythtothassumethmanythfunctionalthroles.
d. Manythofththesethaminothacidsthwerethprobablythavailablethfromthprebioticthreactions.
e. Asthathset,ththeytharethdiverse.
ANSWER:t h b
8. Thethamidethbondthisthathlinkagethbetweenththe:
a. β-aminothgroupthofthonethaminothacidthandththethα-aminothgroupthofthanotherthaminothacid.
b. β-carboxylthgroupthofthonethaminothacidthandththethβ-aminothgroupthofthanotherthaminothacid.
c. δ-carboxylthgroupthofthonethaminothacidthandththethα-carboxylthgroupthofthanotherthaminothacid.
d. α-aminothgroupthofthonethaminothacidthandththethε-aminothgroupthofthanotherthaminothacid.
e. α-carboxylthgroupthofthonethaminothacidthandththethα-aminothgroupthofthanotherthaminothacid.
ANSWER:t h e
9. Whatthisththethamino-terminalthresiduethandthwhatthisththethcarboxyl-
terminalthresiduethinththethsequencethofthaminothacidsthGly-Tyr-Gly-Phe-Leu?
a. LeucinethisthN-terminalthandthglycinethisthC-terminal.
b. GlycinethisthN-terminalthandthleucinethisthC-terminal.
c. TyrosinethisthN-terminalthandthleucinethisthC-terminal.
d. PhenylalaninethisthN-terminalthandthleucinethisthC-terminal.
e. TheretharethnothN-terminalthandthC-terminalthresiduesthinththethsequencesthofthaminothacids.
ANSWER:t h b
10. Oligopeptidethisthathpolypeptidethchainthmadethof:
a. numerousthaminothacids.
b. aminothacidsthwiththathlowthmolecularthweight.
c. positivelythchargedthaminothacids.
d. smallthnumbersthofthaminothacids.
e. negativelythchargedthaminothacids.
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ANSWER:t h d
11. Athproteinthwiththathmolecularthweightthofth75th550thgthmol–1th hasthathmassthof:
a. 75,550thDathorth755.5thkDa.
b. 7555thDathorth75.55thkDa.
c. 75,550thDathorth75.55thkDa.
d. 755,500thDathorth7.555thkDa.
e. 7,555,000thDathorth75550thkDa.
ANSWER:t h c
12. Knowledgethofththethaminothacidthsequencesthisthimportantthforthseveralthreasons.thWhatthisthNOTthon
ethofththosethreasons?
a. Aminothacidthsequencesthdetermineththeththree-dimensionalthstructuresthofthproteins.
b. Thethsequencethofthathproteinthrevealsthmuchthaboutthitsthevolutionarythhistory.
c. Knowledgethofththethsequencethofthathproteinthcanthhelpthtothpreventthmutations.
d. Changesthinththethaminothacidthsequencethcanthleadthtothabnormalthproteinthfunctioningthandthdisease.
e. Thethsequencethofthathproteinthisthnecessarythtothdeterminethitsthfunction.
ANSWER:t h c
13. Choosethatomsththatthliethinthathplanethinthathpairthofthlinkedthaminothacids.
a. Cα3,thC,thO,thN,thCα2
b. Cα,thC,thN,thH,thCα2
c. Cα,thC,thO,thN,thH,thCα3
d. Cα,thCα2,thCα3,thN,thH,thC
e. Cα,thC,thO,thN,thH,thCα2
ANSWER:t h e
14. WhichthstatementthCORRECTLYthdescribethathpeptidethbond?
a. ThethC–Nthdistancethinthathpeptidethbondthisth1.49thÅ;ththethpeptidethbondthisthpositivelythcharged.
b. ThethC–
Nthdistancethinthathpeptidethbondthisth1.27thÅ;ththethbondthresonatesthbetweenthathsinglethbondthan
dthathdoublethbond;ththethpeptidethbondthisthnegativelythcharged.
c. ThethC–
Nthdistancethinthathpeptidethbondthisth1.32thÅ;ththethbondthresonatesthbetweenthathdoublethbondthandthatht
riplethbond;ththethpeptidethbondthisthathkindthofthdipole.
d. ThethC–
Nthdistancethinthathpeptidethbondthisth1.35thÅ;ththethbondthresonatesthbetweenthathsinglethbondthandthathtr
iplethbond;ththethpeptidethbondthisthathkindthofthdipole.
e. ThethC–
Nthdistancethinthathpeptidethbondthisth1.30thÅ;ththethbondthresonatesthbetweenthathdoublethbondthandthatht
riplethbond;ththethpeptidethbondthisthpositivelythcharged.
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