Test Bank For Becker-s World of the Cell, 10th Edition (Hardin, 2022) All Chapters 1-29.pdf

Becker'snWorldnofnthenCell,n8en(Hardin/Bertoni/Kleinsmith)
Chaptern13n SignalnTransductionnMechanisms:nI.nElectricalnandnSynapticnSignalingninnNeur
ons

MultiplenChoicenQuestions

1) Thenportionnofnthennervousnsystemnthatnisnassociatednwithnthencontrolnofninvoluntarynactivitiesni
snthe
A) centralnnervousnsystem.
B) peripheralnnervousnsystem.
C) autonomicnnervousnsystem.
D) somaticnnervousnsystem.
E) automaticnnervousnsystem.n
Answer:n C

2) Allnofnthenfollowingnarenglialncellsnexcept
A) interneurons.
B) oligodendrocytes.
C) astrocytes.
D) Schwannncells.
E) bothnchoicesnAnandnDn
Answer:n A

3) Thenaxonnbranchesnofnantypicalnneuronnterminatenatnstructuresncalled
A) synapses.
B) boutons.
C) glia.
D) nodesnofnRanvier.
E) myelinnsheath.
Answer:n B

4) Thenrestingnpotentialnofnanparticularnnervencellnisn-
66nmV.nDepolarizationnofnthenmembranenwillnshiftnthenmembranenpotentialntoward
A) -90nmV.
B) -66nmV.
C) 0nmV.
D) Therenwillnbennonchange.
E) Therenisnnotnenoughninformationntontell.n
Answer:n C




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,5) Ofnallnofnthenionsnassociatednwithngeneratingnthenrestingnmembranenpotential,nthenpermeabilityno
fnthenmembranenton nisnthenmostnimportant.

A) sodiumnions
B) potassiumnions
C) chloridenions
D) allnofnthenabove
E) nonenofnthenaboven
Answer:n B

Basenyournanswersntonthenquestionsnbelownonnthenfollowingninformation:

Usingnthenpatchnclampntechnique,nanresearchernmeasuresnansinglenchannelninnanmembrane.nT
henreceptornchannelnpassesn3npAn(picoamperes)nofnionicncurrentnovernanperiodnofn8nmsecnat
-60nmV;n 1npAn=n10n-12nampere.

6) Annelectricalncurrentnofn1nAnisnapproximatelyn6nxn1018nelectricalnchargesnpernsecond;nhown
manynionsnpassnthroughnthenchannelnwhennitnisnopen?
A) 144,000nions
B) 2400nions
C) 8,640,000nions
D) 8640nions
E) Youncannotndeterminenthisnfromntheninformationngiven.n
Answer:n A

7) Basednonnyournknowledgenofnnerventransmission,nthisnmovementnofnionsnwill
A) stimulatenanchangeninnanpostsynapticnmembrane.
B) notnstimulatenanchangeninnanpostsynapticnmembrane.
C) stimulatenanchangeninnanpostsynapticnmembranenifnthreenchannelneventsnarencombined.
D) stimulatenanchangeninnanpostsynapticnmembranenifn50nchannelneventsnarencombined.
E) generatenancurrentnresultingninnmembranendepolarization.n
Answer:n B




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,Basenyournanswersntonthenfollowingnquestion(s)nonnthengraphnbelow,ndepictingnannactionnpote
ntial.




Figuren13.1

8) Innthengraphnabove,nthenpointnatnwhichnthenpotassiumnchannelsnopennisnindicatednbynthenletter
A) A.
B) B.
C) C.
D) D.
E) E.
Answer:n C

9) Basednonnthengraphnabove,nthenthresholdnvoltagenappearsntonbenapproximately
A) 60nmV.
B) 30nmV.
C) 0nmV.
D) -30nmV.
E) -60nmV.
Answer:n E

10) Basednonnthengraphnabove,nafternapproximatelynwhatnperiodnofntimencouldnanothernimpulsenbenp
ropagated?
A) 1nmsec
B) 2nmsec
C) 3nmsec
D) 4nmsec
E) immediatelynfollowingnthenfirstnstimulationn
Answer:n C

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, 11) Innthengraphnabove,natnwhatnpointninnthenactionnpotentialnwillnthensodiumnchannelsnbenopened?
A)nA
B)nB
C)nC
D)nD
E)nE
Answer:n A

12) Referntonthengraphnabove.nIfnthenmyelinnfibersnwerenstrippednfromnthisnmembrane,nyounwouldne
xpectnthenactionnpotentialncyclentongo
A) muchnfasternthanndepictedninnthengraph.
B) muchnfasternthannnormalnbutnnotnpeaknatn30nmV.
C) slowernthanndepictedninnthengraph.
D) muchnslowernthannnormalnbutnpeaknmuchnhighernthann30nmV.
E) nonenofnthenaboven
Answer:n C

13) ThenpartsnofnthengraphnindicatednatnpointsnC,nD,nandnEnrepresent
A) depolarization.
B) hyperpolarization.
C) thenrefractorynperiod.
D) repolarization.
E) sodiumnchannelnactivity.n
Answer:n D

14) Referntonthengraphnabove.nAtnthensamentimenthatnthenstimulusnwasnintroduced,nandrugnthatnspeci
ficallyninhibitsnsodiumnchannelsnwasnaddedntonthensystem.nTheneffectnthisnwouldnhavenisnthatnthenme
mbranenwould
A) notndepolarize.
B) depolarizenfornthenfirstnimpulsenbutnnotnfornansecondnone.
C) notnbenablentonrepolarize.
D) repolarize,nbutnwouldnnotnfornansecondnimpulse.
E) nonenofnthenaboven
Answer:n A

15) Asnanresultnofnthenwaynnervenimpulsesnarenpropagated,ntheynarenunidirectional.nWhichnofnthenf
ollowingndoesnnotncontributentonthisnphenomenon?
A) Thentimenintervalnencompassednbynthenrefractorynperiodndoesnnotnallownthenimpulsentontravelni
nnreverse.
B) Presynapticnneurotransmittersnandnpostsynapticnreceptorsnarenseparated.
C) Unidirectionalnsodiumnandnpotassiumnchannelsnopennonlyntowardnthenaxonnofnthennervencell.
D) Sensorynprocessesnarenorientedninnsuchnanmannernthatntheninformationnisntargetedntonthend
endritesnofnthennervencell.
E) nonenofnthenaboven
Answer:n C



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