Test Bank - Becker-s World of the Cell, 10th Edition (Hardin, 2024) Chapter 1-26 All Chapters Completed

Becker'sbWorldbofbthebCell,b8eb(Hardin/Bertoni/Kleinsmith)
Chapterb13b SignalbTransductionbMechanisms:bI.bElectricalbandbSynapticbSignalingbinbNeur
ons

MultiplebChoicebQuestions

1) Thebportionbofbthebnervousbsystembthatbisbassociatedbwithbthebcontrolbofbinvoluntarybactivitiesbi
sbthe
A) centralbnervousbsystem.
B) peripheralbnervousbsystem.
C) autonomicbnervousbsystem.
D) somaticbnervousbsystem.
E) automaticbnervousbsystem.b
Answer:b C

2) Allbofbthebfollowingbarebglialbcellsbexcept
A) interneurons.
B) oligodendrocytes.
C) astrocytes.
D) Schwannbcells.
E) bothbchoicesbAbandbDb
Answer:b A

3) Thebaxonbbranchesbofbabtypicalbneuronbterminatebatbstructuresbcalled
A) synapses.
B) boutons.
C) glia.
D) nodesbofbRanvier.
E) myelinbsheath.
Answer:b B

4) Thebrestingbpotentialbofbabparticularbnervebcellbisb-
66bmV.bDepolarizationbofbthebmembranebwillbshiftbthebmembranebpotentialbtoward
A) -90bmV.
B) -66bmV.
C) 0bmV.
D) Therebwillbbebnobchange.
E) Therebisbnotbenoughbinformationbtobtell.b
Answer:b C




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,5) Ofballbofbthebionsbassociatedbwithbgeneratingbthebrestingbmembranebpotential,bthebpermeabilitybo
fbthebmembranebtob bisbthebmost bimportant.

A) sodiumbions
B) potassiumbions
C) chloridebions
D) allbofbthebabove
E) nonebofbthebaboveb
Answer:b B

Basebyourbanswersbtobthebquestionsbbelowbonbthebfollowingbinformation:

Usingbthebpatchbclampbtechnique,babresearcherbmeasuresbabsinglebchannelbinbabmembrane.bT
hebreceptorbchannelbpassesb3bpAb(picoamperes)bofbionicbcurrentboverbabperiodbofb8bmsecbat
-60bmV;b 1bpAb=b10b-12bampere.

6) Anbelectricalbcurrentbofb1bAbisbapproximatelyb6bxb1018belectricalbchargesbperbsecond;bhowb
manybionsbpassbthroughbthebchannelbwhenbitbisbopen?
A) 144,000bions
B) 2400bions
C) 8,640,000bions
D) 8640bions
E) Youbcannotbdeterminebthisbfrombthebinformationbgiven.b
Answer:b A

7) Basedbonbyourbknowledgebofbnervebtransmission,bthisbmovementbofbionsbwill
A) stimulatebabchangebinbabpostsynapticbmembrane.
B) notbstimulatebabchangebinbabpostsynapticbmembrane.
C) stimulatebabchangebinbabpostsynapticbmembranebifbthreebchannelbeventsbarebcombined.
D) stimulatebabchangebinbabpostsynapticbmembranebifb50bchannelbeventsbarebcombined.
E) generatebabcurrentbresultingbinbmembranebdepolarization.b
Answer:b B




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,Basebyourbanswersbtobthebfollowingbquestion(s)bonbthebgraphbbelow,bdepictingbanbactionbpote
ntial.




Figureb13.1

8) Inbthebgraphbabove,bthebpointbatbwhichbthebpotassiumbchannelsbopenbisbindicatedbbybthebletter
A) A.
B) B.
C) C.
D) D.
E) E.
Answer:b C

9) Basedbonbthebgraphbabove,bthebthresholdbvoltagebappearsbtobbebapproximately
A) 60bmV.
B) 30bmV.
C) 0bmV.
D) -30bmV.
E) -60bmV.
Answer:b E

10) Basedbonbthebgraphbabove,bafterbapproximatelybwhatbperiodbofbtimebcouldbanotherbimpulsebbebp
ropagated?
A) 1bmsec
B) 2bmsec
C) 3bmsec
D) 4bmsec
E) immediatelybfollowingbthebfirstbstimulationb
Answer:b C

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, 11) Inbthebgraphbabove,batbwhatbpointbinbthebactionbpotentialbwillbthebsodiumbchannelsbbebopened?
A)bA
B)bB
C)bC
D)bD
E)bE
Answer:b A

12) Referbtobthebgraphbabove.bIfbthebmyelinbfibersbwerebstrippedbfrombthisbmembrane,byoubwouldbe
xpectbthebactionbpotentialbcyclebtobgo
A) muchbfasterbthanbdepictedbinbthebgraph.
B) muchbfasterbthanbnormalbbutbnotbpeakbatb30bmV.
C) slowerbthanbdepictedbinbthebgraph.
D) muchbslowerbthanbnormalbbutbpeakbmuchbhigherbthanb30bmV.
E) nonebofbthebaboveb
Answer:b C

13) ThebpartsbofbthebgraphbindicatedbatbpointsbC,bD,bandbEbrepresent
A) depolarization.
B) hyperpolarization.
C) thebrefractorybperiod.
D) repolarization.
E) sodiumbchannelbactivity.b
Answer:b D

14) Referbtobthebgraphbabove.bAtbthebsamebtimebthatbthebstimulusbwasbintroduced,babdrugbthatbspeci
ficallybinhibitsbsodiumbchannelsbwasbaddedbtobthebsystem.bThebeffectbthisbwouldbhavebisbthatbthebme
mbranebwould
A) notbdepolarize.
B) depolarizebforbthebfirstbimpulsebbutbnotbforbabsecondbone.
C) notbbebablebtobrepolarize.
D) repolarize,bbutbwouldbnotbforbabsecondbimpulse.
E) nonebofbthebaboveb
Answer:b A

15) Asbabresultbofbthebwaybnervebimpulsesbarebpropagated,btheybarebunidirectional.bWhichbofbthebf
ollowingbdoesbnotbcontributebtobthisbphenomenon?
A) Thebtimebintervalbencompassedbbybthebrefractorybperiodbdoesbnotballowbthebimpulsebtobtravelbi
nbreverse.
B) Presynapticbneurotransmittersbandbpostsynapticbreceptorsbarebseparated.
C) Unidirectionalbsodiumbandbpotassiumbchannelsbopenbonlybtowardbthebaxonbofbthebnervebcell.
D) Sensorybprocessesbareborientedbinbsuchbabmannerbthatbthebinformationbisbtargetedbtobthebd
endritesbofbthebnervebcell.
E) nonebofbthebaboveb
Answer:b C



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Copyrightb©b2012bPearsonbEducation,bInc.