Microbiology Exam #2 (practice test questions) With Ready Answers

Microbiology Exam #2 (practice test
questions) With Ready Answers

Axculturexmediumxconsistingxofxagar,xpeptone,xandxbeefxheart,xwhichxarexsubstancesxinxwh
ichxthexamountxofxingredientsxarexunspecified,xisxa...
A.xchemicallyxdefinedxmedium
B.xcomplexxmediumx
C.xselectivexmediumx
D.xdifferentialxmediumx
E.xreducingxmediumx-xCORRECTxxANSWER-B.xcomplexxmedium

Axculturexmediumxwhichxonlyxgram-
positivexorganismsxgrow,xandxinxwhichxaxyellowxhaloxsurroundsxStaphylococcusxaureusxcol
inies,xdistinguishingxS.xaureusxfromxotherxgrowingxspecies,xisxbestxdescribedxas...
A.xaxselective,xbutxnotxdifferentialxmedium
B.xaxdifferential,xbutxnotxselectivexmediumx
C.xanxenrichmentxculture
D.xbothxaxselectivexaxdifferentialxmediumx
E.xbothxaxdifferentialxandxenrichmentxculturex-xCORRECTxxANSWER-
D.xbothxaxselectivexandxdifferentialxmedium

Axgenexisxbestxdefinedxas...
A.xaxsegmentxofxDNA
B.xthreexnucleotidesxthatxcodexforxanxaminoxacid
C.xaxsequencexofxnucleotidesxinxDNAxthatxcodesxforxaxfunctionalxproductx
D.xaxsequencexofxnucleotidesxinxRNAxthatxcodesxforxaxfunctionalxproductx-
xCORRECTxxANSWER-

C.xaxsequencexofxnucleotidesxinxDNAxthatxcodesxforxaxfunctionalxproduct

AxpiecexofxDNAxthatxisxself-
replicatingxandxusedxtoxcarryxdesiredxgenesxintoxnewxcellsxisxcalledxa(n)...
A.xlibrary
B.xclone
C.xvectorx
D.xintronx-xCORRECTxxANSWER-C.xvector

, Axpopulationxofxcellsxthatxarexgeneticallyxidenticalxandxmayxbexcarryingxaxdesiredxplasmidxis
xcalledxa(n)...

A.xgenus
B.xclonex
C.xvectorx
D.xintronx-xCORRECTxxANSWER-B.xclone

Axrestrictionxenzymexis...
A.xaxgene
B.xaxsegmentxofxDNA
C.xaxsegmentxifxmRNA
D.xaxproteinxthatxcatalyzesxthexcuttingxofxDNAxatxspecificxsequencesx-
xCORRECTxxANSWER-

D.xaxproteinxthatxcatalyzesxthexcuttingxofxDNAxatxspeciflaxsequences

AxtransferxRNAx(tRNA)xcarries...
A.xthexmRNaxtranscriptxtoxthexribosome
B.xthexproperxaminoxacid
C.xthexstopxcodonxtotxhexribosomex
D.xRNAxpolymerasextoxthexribosomex-xCORRECTxxANSWER-B.xthexproperxaminoxacid

Axvirusxthatxinfectsxbacteriaxisxcalled...
A.xbacteriovirus
B.xbacteriophage
C.xbactovirus
D.xbactophagex-xCORRECTxxANSWER-B.xbacteriophage

AnxadvantagexofxcDNAxoverxgenomicxDNAxforxcloningxgenesxeukayotesxthatxarexexpressib
lexinxprokayotesxisxthatxit...
A.xlackxexons
B.xlacksxintronsx
C.xcontainsxplasmidxDNA
D.xdoesxnotxrequiresxaxspecialxenzymex-xCORRECTxxANSWER-B.xlacksxintrons

AnxenzymexthatxunwindsxDNAxstrandsxsoxthatxeachxstrandxcalxbexreplicatedxis...
A.xRNAxpolymerase
B.xDNAxligase
C.xDNAxhelicase
D.xDNAxpolymerasex-xCORRECTxxANSWER-C.xDNAxhelicase

Atx4:00xpmxaxclosedxflaskxinxinoculatedxwithx1,000xcells.xThexlagxphasexlastsx1xhour.xAtx9:00
xpmxthexculturexentersxstationaryxphasexwithaxpopulationxofx65xmillionxcells.xThexnumberxofx

generationxthatxhavexoccurredxis...
A.x15
B.x16
C.x17