MCB 100 UIUC EXAM 2 2025 EXAM QUESTIONS AN
ANSWERS
How cdo chumans cacquire cthis cdisease? c(Histoplasma ccapsulatum)
-This cis ca cdisease cof cold cage. cPeople cunder c60 cyears cold care crarely caffected.
-This cdisease cis cmost ccommonly cacquired cby cinhalation.
-This cdisease cis chighly ccontagious cand creadily cpassed cfrom cperson cto cperson cby ccoughing/sn
-This cdisease cis ctransmitted cby cthe cfecal-oral croute. c- cCORRECT cANS✔✔This cdisease cis cmo
cinhalation.
Choose cfrom cthe cfollowing cstatements cthe cones cthat ccorrectly cdiscuss creproduction cusing cbina
cCORRECT cANS✔✔-Each cdaughter ccell cis can cexact ccopy cof cthe cother, cboth cgenetically cand c
-Due cto cthe cstretching cof cthe ccytoplasmic cmembrane, cboth ccells cwill ccontain ca ccomplete cgeno
Choose cthe ccharacteristics cthat cseparate cthe carchaea cfrom cother cprokaryotic ccells. c- cCORREC
cpeptidoglycan cin ctheir ccell cwalls.
-The ccytoplasmic cmembrane clipids cof carchaea chave cbranched cor cringform chydrocarbon cchains
Which cof cthe cfollowing ccharacteristics cwould cNOT cbe cused cto caid cin cclassifying ca cnewly cdisco
cCORRECT cANS✔✔Cellular cSize
A cbacterial cspecies cwith cspherical ccells cthat chave crandom cplanes cof ccell cdivision cwill cform cwh
carrangements? c- cCORRECT cANS✔✔Staphylococci
In cwhich cof cthe cfollowing cmethods cof cprokaryotic creproduction cdoes cthe cparental ccell cremain c
cevent cto ccontinue cthe cprocess? c- cCORRECT cANS✔✔Budding
Which cof cthe cfollowing ccorrectly cdescribes cthe cfunction cof cbacterial cendospores? c- cCORRECT
cproduced cas cresting cstages cof cthe cbacterium cthat ccan csurvive cinhospitable cconditions.
What care cflexible, cspiral-shaped cbacteria ccalled? c- cCORRECT cANS✔✔Spirochetes
What ctype cof carrangement coccurs cwhen cbacilli cdivide cby csnapping cdivision? c- cCORRECT cAN
True cor cFalse: cVarious cspecies cof cStreptomyces care cimportant csources cof cantibiotics. c- cCORR
,Which cof cthe cfollowing cis cNOT ca cproperty cof cLactobacilli? c- cCORRECT cANS✔✔They care cme
cGram-positive cbacteria.
Which cof cthe cfollowing cstatements cis cfalse?
-The cgrouping cof cmicroorganisms cin ca cphylogenetic cscheme cthat cis cbased con cnucleic cacid cse
cthe csame cas cthe cgrouping cof cmicroorganisms cin ca ctaxonomic cscheme cbased con cmorphologic
-The ccells cof cprokaryotic corganisms care cdivided cinto ccompartments cby cinternal cmembranes.
In cthe cmost cpopular ccurrent cphylogenetic cscheme, cprokaryotic corganisms care cdivided cinto c2 cd
cArchaea.
-Most cif cnot call cof cthe cchemoautotrophic corganisms con cEarth care cprokaryotes.
-The ccells cof cprokaryotic cmicroorganisms ccontain c70S cribosomes cand cmost chave ccircular cchro
cANS✔✔The ccells cof cprokaryotic corganisms care cdivided cinto ccompartments cby cinternal cmembr
When cPseudomonas caeruginosa cis cgrown cin cLB cunder caerobic cconditions cand cthen cstained cf
care ca cring cas cshown cfor cthe cleft ctube. cWhen cthe cbacteria care cgrown canaerobically cin cthe cpr
cresults con cthe cright care cobtained. cWhich cstatement cbest cexplains cthe cobserved cresults? c(ther
-Arg ccaused cthe cP. caeruginosa cbacteria cto clyse cunder canaerobic cconditions cand call cthe cpolys
ctube cwall.
-Arg cstimulated cthe cP. caeruginosa cbacteria cto cmake cmuch cmore cpolysaccharide cslime cthat cco
-The cArg cdissolved cthe cpolysaccharide cinto chydrophobic clayers cthat ccoated cthe ctube cwall.
-The cP. caeruginosa cbacteria cused cArg cto cgrow canaerobically, cso cthat cit cno clonger chad cto cgro
cwhich callowed cit cto cform ca cbiofilm call cover cthe ctube cwall.
-The chydrophobic cArg cin cthe cmedium ccoated cthe ctube cwall cand cwas csta c- cCORRECT cANS✔
cused cArg cto cgrow canaerobically, cso cthat cit cno clonger chad cto cgrow cat cthe cair-liquid cinterface,
cbiofilm call cover cthe ctube cwall.
Why cdo cdoctors ccaution cpatients cwho care cpregnant cto cavoid cdeli cmeats, ccold ccuts, cand csoft c
-Fermentation cof cthose cfood cby cListeria cwill ccause cnausea.
-The cListeria cbacteria ccan cmake cthese cfoods ctaste csour.
-The cListeria cbacteria ccan cdegrade cthe cnutrients cin cthe cfood.
-These cfoods care csoft cand ceasy cfor cthe cbacteria cto cspread cthroughout.
-The cListeria cbacteria ccan ceasily cgrow cin cthe cuncooked cfood cstored cin cthe crefrigerator. c- cCOR
care csoft cand ceasy cfor cthe cbacteria cto cspread cthroughout.
-The cListeria cbacteria ccan ceasily cgrow cin cthe cuncooked cfood cstored cin cthe crefrigerator.
(2 canswer ctrick cquestion)
Listeria cvirulence cis cdirectly crelated cto cits cability cto
-produce cpowerful ctoxins cthat clyse ceukaryotic ccells.
-form cresistant cendospores cthat ccan cwithstand charsh cchemical cenvironments.
-live cwithin ccells cand cthus cavoid cexposure cto cthe cimmune csystem cof cits chost.
-move crapidly cthrough cthe cbody cusing cmultiple cflagella ccalled ccomet ctails.
-resist cmost cantimicrobial cagents cdue cto cresistant ccell cwalls. c- cCORRECT cANS✔✔live cwithin c
cto cthe cimmune csystem cof cits chost.
A ctwenty-year-old cpatient cexhibiting cheadache, cstiff cneck, cvomiting, cand cconvulsions chas cGram
cin cher cspinal cfluid. cThe cnurse cpractitioner cwill clikely cdiagnose cinfection cwith
Cryptococcus.
Haemophilus.
Streptococcus.
Neisseria. c- cCORRECT cANS✔✔Neisseria
,Which cof cthe cfollowing ctests cwould cbe cuseful cin cidentifying cEscherichia ccoli?
-E. ccoli cis ca cGram-negative cdiplococcus cthat cferments clactose cand cglucose, cbut cnot csucrose. c
ccitrate. cIt ccannot cproduce curease.
-E. ccoli cis ca cGram-negative cbacillus cthat cferments clactose cand cglucose, cbut cnot csucrose. cIt cis
ccitrate cor curea.
-E. ccoli cis ca cGram-negative cbacillus cthat cferments cglucose cand csucrose, cbut cnot clactose. cIt cis
ccitrate cor curea.
-E. ccoli cis ca cGram-negative cbacillus cthat cferments cglucose cand csucrose, cbut cnot clactose. cIt cis
curease, cbut cit cdoes cnot cutilize ccitrate. c- cCORRECT cANS✔✔E. ccoli cis ca cGram-negative cbacill
cglucose, cbut cnot csucrose. cIt cis cmotile cand cdoes cnot cutilize ccitrate cor curea.
Why cwere ccorticosteroids ccontraindicated cin cthis ccase?
-Corticosteroids cincrease cthe cpermeability cof cblood cvessels, ccausing ctissue cswelling.
-Corticosteroids cproduce cbronchoconstriction.
-Corticosteroids care cimmunosuppressive.
-Corticosteroids care ca ctype cof cantibiotic. c- cCORRECT cANS✔✔Corticosteroids care cimmunosupp
Further ctesting creveals cthis cis ca cstrain cof cE. ccoli cO157:H7. cWhat cvirulence cfactor cproduced cb
cheart cand clung cdamage cobserved cin cthis ccase?
endospores
Shiga-like ctoxin
enterotoxin
flagella c- cCORRECT cANS✔✔Shiga-like ctoxin
The cTexas cDepartment cof cHealth chas cisolated cYersinia cpestis cfrom cwood crats cand cprairie cdog
cTexas cpanhandle. cIn caddition cto cthe cfever, cchills, cand csevere cheadache, cthis cpatient chas cdev
cthe cskin. cWhat cdisease cis cthis ccamper clikely cto chave?
septicemic cplague
bubonic cplague
pneumonic cplague
tularemia c- cCORRECT cANS✔✔bubonic cplague
What care cswollen, cpainful clymph cnodes ccalled?
tabes
Ghon ccomplexes cin cthe clungs
hives
buboes c- cCORRECT cANS✔✔buboes
Which cof cthe cfollowing cis ca creservoir cfor cthe cnatural cendemic ccycle cof cYersinia cpestis?
flea
rat
dog
tick c- cCORRECT cANS✔✔rat
Which cof cthe cfollowing cis can camplifying chost cof cYersinia cpestis?
rat
rabbit
flea
tick c- cCORRECT cANS✔✔rabbit
, tomato c- cCORRECT cANS✔✔sprouts
Which cof cthe cfollowing cmedia cis cused cto cisolate cGram-negative corganisms?
blood cagar cplate
mannitol csalt cagar cplate
tryptic csoy cagar cplate
MacConkey's cagar cplate c- cCORRECT cANS✔✔MacConkey's cagar cplate
The corganism cisolated cfrom cthe csprouts cis coxidase cnegative, cmotile, cferments cglucose cand cla
ccitrate. cWhat corganism cis cit?
Escherichia ccoli
Enterobacter caerogenes
Salmonella centerica
Shigella csonnei c- cCORRECT cANS✔✔Escherichia ccoli
What cis cthe cbest cway cto cprevent cthe cspread cof cthis cinfection c(E. cColi)?
-All cfood chandlers care crequired cto cwash ctheir chands cthoroughly cafter csneezing.
-All cfood chandlers care crequired cto cwash ctheir chands cthoroughly cafter cusing cthe crestroom.
-All cfood chandlers care crequired cto cclean crestrooms cat cthe cbeginning cof ctheir cshift.
-All cfood chandlers care crequired cto cwear cgloves cto cprotect cthemselves cfrom cany cpotential cbact
cCORRECT cANS✔✔All cfood chandlers care crequired cto cwash ctheir chands cthoroughly cafter cusin
What cis cthe crecommended ccourse cof ctherapy c(for ce. cColi)?
oral cfluids
soft cfood cdiet
intravenous cfluid creplacement
antibiotics c- cCORRECT cANS✔✔oral cfluids
Which ccondition cis cassociated cwith cbacterial cinfection cof cthe cbladder?
pyelonephritis
urethritis
bacteremia
cystitis c- cCORRECT cANS✔✔cystitis
Some cstrains cof cE. ccoli chave c__________ callowing cthem cto cbind cand cthen center cinto cepitheli
fimbriae
flagella
gram-negative ccell cwall
cilia c- cCORRECT cANS✔✔fimbriae
What cis cthe cprimary csource cof cinfection cfor cUTIs?
Sexual cintercourse
Contaminated cdrinking cwater
Fecal ccontamination
Dehydration c- cCORRECT cANS✔✔Fecal ccontamination
Which cdemographic cis cmost clikely cto cdevelop ca curinary ctract cinfection?
ANSWERS
How cdo chumans cacquire cthis cdisease? c(Histoplasma ccapsulatum)
-This cis ca cdisease cof cold cage. cPeople cunder c60 cyears cold care crarely caffected.
-This cdisease cis cmost ccommonly cacquired cby cinhalation.
-This cdisease cis chighly ccontagious cand creadily cpassed cfrom cperson cto cperson cby ccoughing/sn
-This cdisease cis ctransmitted cby cthe cfecal-oral croute. c- cCORRECT cANS✔✔This cdisease cis cmo
cinhalation.
Choose cfrom cthe cfollowing cstatements cthe cones cthat ccorrectly cdiscuss creproduction cusing cbina
cCORRECT cANS✔✔-Each cdaughter ccell cis can cexact ccopy cof cthe cother, cboth cgenetically cand c
-Due cto cthe cstretching cof cthe ccytoplasmic cmembrane, cboth ccells cwill ccontain ca ccomplete cgeno
Choose cthe ccharacteristics cthat cseparate cthe carchaea cfrom cother cprokaryotic ccells. c- cCORREC
cpeptidoglycan cin ctheir ccell cwalls.
-The ccytoplasmic cmembrane clipids cof carchaea chave cbranched cor cringform chydrocarbon cchains
Which cof cthe cfollowing ccharacteristics cwould cNOT cbe cused cto caid cin cclassifying ca cnewly cdisco
cCORRECT cANS✔✔Cellular cSize
A cbacterial cspecies cwith cspherical ccells cthat chave crandom cplanes cof ccell cdivision cwill cform cwh
carrangements? c- cCORRECT cANS✔✔Staphylococci
In cwhich cof cthe cfollowing cmethods cof cprokaryotic creproduction cdoes cthe cparental ccell cremain c
cevent cto ccontinue cthe cprocess? c- cCORRECT cANS✔✔Budding
Which cof cthe cfollowing ccorrectly cdescribes cthe cfunction cof cbacterial cendospores? c- cCORRECT
cproduced cas cresting cstages cof cthe cbacterium cthat ccan csurvive cinhospitable cconditions.
What care cflexible, cspiral-shaped cbacteria ccalled? c- cCORRECT cANS✔✔Spirochetes
What ctype cof carrangement coccurs cwhen cbacilli cdivide cby csnapping cdivision? c- cCORRECT cAN
True cor cFalse: cVarious cspecies cof cStreptomyces care cimportant csources cof cantibiotics. c- cCORR
,Which cof cthe cfollowing cis cNOT ca cproperty cof cLactobacilli? c- cCORRECT cANS✔✔They care cme
cGram-positive cbacteria.
Which cof cthe cfollowing cstatements cis cfalse?
-The cgrouping cof cmicroorganisms cin ca cphylogenetic cscheme cthat cis cbased con cnucleic cacid cse
cthe csame cas cthe cgrouping cof cmicroorganisms cin ca ctaxonomic cscheme cbased con cmorphologic
-The ccells cof cprokaryotic corganisms care cdivided cinto ccompartments cby cinternal cmembranes.
In cthe cmost cpopular ccurrent cphylogenetic cscheme, cprokaryotic corganisms care cdivided cinto c2 cd
cArchaea.
-Most cif cnot call cof cthe cchemoautotrophic corganisms con cEarth care cprokaryotes.
-The ccells cof cprokaryotic cmicroorganisms ccontain c70S cribosomes cand cmost chave ccircular cchro
cANS✔✔The ccells cof cprokaryotic corganisms care cdivided cinto ccompartments cby cinternal cmembr
When cPseudomonas caeruginosa cis cgrown cin cLB cunder caerobic cconditions cand cthen cstained cf
care ca cring cas cshown cfor cthe cleft ctube. cWhen cthe cbacteria care cgrown canaerobically cin cthe cpr
cresults con cthe cright care cobtained. cWhich cstatement cbest cexplains cthe cobserved cresults? c(ther
-Arg ccaused cthe cP. caeruginosa cbacteria cto clyse cunder canaerobic cconditions cand call cthe cpolys
ctube cwall.
-Arg cstimulated cthe cP. caeruginosa cbacteria cto cmake cmuch cmore cpolysaccharide cslime cthat cco
-The cArg cdissolved cthe cpolysaccharide cinto chydrophobic clayers cthat ccoated cthe ctube cwall.
-The cP. caeruginosa cbacteria cused cArg cto cgrow canaerobically, cso cthat cit cno clonger chad cto cgro
cwhich callowed cit cto cform ca cbiofilm call cover cthe ctube cwall.
-The chydrophobic cArg cin cthe cmedium ccoated cthe ctube cwall cand cwas csta c- cCORRECT cANS✔
cused cArg cto cgrow canaerobically, cso cthat cit cno clonger chad cto cgrow cat cthe cair-liquid cinterface,
cbiofilm call cover cthe ctube cwall.
Why cdo cdoctors ccaution cpatients cwho care cpregnant cto cavoid cdeli cmeats, ccold ccuts, cand csoft c
-Fermentation cof cthose cfood cby cListeria cwill ccause cnausea.
-The cListeria cbacteria ccan cmake cthese cfoods ctaste csour.
-The cListeria cbacteria ccan cdegrade cthe cnutrients cin cthe cfood.
-These cfoods care csoft cand ceasy cfor cthe cbacteria cto cspread cthroughout.
-The cListeria cbacteria ccan ceasily cgrow cin cthe cuncooked cfood cstored cin cthe crefrigerator. c- cCOR
care csoft cand ceasy cfor cthe cbacteria cto cspread cthroughout.
-The cListeria cbacteria ccan ceasily cgrow cin cthe cuncooked cfood cstored cin cthe crefrigerator.
(2 canswer ctrick cquestion)
Listeria cvirulence cis cdirectly crelated cto cits cability cto
-produce cpowerful ctoxins cthat clyse ceukaryotic ccells.
-form cresistant cendospores cthat ccan cwithstand charsh cchemical cenvironments.
-live cwithin ccells cand cthus cavoid cexposure cto cthe cimmune csystem cof cits chost.
-move crapidly cthrough cthe cbody cusing cmultiple cflagella ccalled ccomet ctails.
-resist cmost cantimicrobial cagents cdue cto cresistant ccell cwalls. c- cCORRECT cANS✔✔live cwithin c
cto cthe cimmune csystem cof cits chost.
A ctwenty-year-old cpatient cexhibiting cheadache, cstiff cneck, cvomiting, cand cconvulsions chas cGram
cin cher cspinal cfluid. cThe cnurse cpractitioner cwill clikely cdiagnose cinfection cwith
Cryptococcus.
Haemophilus.
Streptococcus.
Neisseria. c- cCORRECT cANS✔✔Neisseria
,Which cof cthe cfollowing ctests cwould cbe cuseful cin cidentifying cEscherichia ccoli?
-E. ccoli cis ca cGram-negative cdiplococcus cthat cferments clactose cand cglucose, cbut cnot csucrose. c
ccitrate. cIt ccannot cproduce curease.
-E. ccoli cis ca cGram-negative cbacillus cthat cferments clactose cand cglucose, cbut cnot csucrose. cIt cis
ccitrate cor curea.
-E. ccoli cis ca cGram-negative cbacillus cthat cferments cglucose cand csucrose, cbut cnot clactose. cIt cis
ccitrate cor curea.
-E. ccoli cis ca cGram-negative cbacillus cthat cferments cglucose cand csucrose, cbut cnot clactose. cIt cis
curease, cbut cit cdoes cnot cutilize ccitrate. c- cCORRECT cANS✔✔E. ccoli cis ca cGram-negative cbacill
cglucose, cbut cnot csucrose. cIt cis cmotile cand cdoes cnot cutilize ccitrate cor curea.
Why cwere ccorticosteroids ccontraindicated cin cthis ccase?
-Corticosteroids cincrease cthe cpermeability cof cblood cvessels, ccausing ctissue cswelling.
-Corticosteroids cproduce cbronchoconstriction.
-Corticosteroids care cimmunosuppressive.
-Corticosteroids care ca ctype cof cantibiotic. c- cCORRECT cANS✔✔Corticosteroids care cimmunosupp
Further ctesting creveals cthis cis ca cstrain cof cE. ccoli cO157:H7. cWhat cvirulence cfactor cproduced cb
cheart cand clung cdamage cobserved cin cthis ccase?
endospores
Shiga-like ctoxin
enterotoxin
flagella c- cCORRECT cANS✔✔Shiga-like ctoxin
The cTexas cDepartment cof cHealth chas cisolated cYersinia cpestis cfrom cwood crats cand cprairie cdog
cTexas cpanhandle. cIn caddition cto cthe cfever, cchills, cand csevere cheadache, cthis cpatient chas cdev
cthe cskin. cWhat cdisease cis cthis ccamper clikely cto chave?
septicemic cplague
bubonic cplague
pneumonic cplague
tularemia c- cCORRECT cANS✔✔bubonic cplague
What care cswollen, cpainful clymph cnodes ccalled?
tabes
Ghon ccomplexes cin cthe clungs
hives
buboes c- cCORRECT cANS✔✔buboes
Which cof cthe cfollowing cis ca creservoir cfor cthe cnatural cendemic ccycle cof cYersinia cpestis?
flea
rat
dog
tick c- cCORRECT cANS✔✔rat
Which cof cthe cfollowing cis can camplifying chost cof cYersinia cpestis?
rat
rabbit
flea
tick c- cCORRECT cANS✔✔rabbit
, tomato c- cCORRECT cANS✔✔sprouts
Which cof cthe cfollowing cmedia cis cused cto cisolate cGram-negative corganisms?
blood cagar cplate
mannitol csalt cagar cplate
tryptic csoy cagar cplate
MacConkey's cagar cplate c- cCORRECT cANS✔✔MacConkey's cagar cplate
The corganism cisolated cfrom cthe csprouts cis coxidase cnegative, cmotile, cferments cglucose cand cla
ccitrate. cWhat corganism cis cit?
Escherichia ccoli
Enterobacter caerogenes
Salmonella centerica
Shigella csonnei c- cCORRECT cANS✔✔Escherichia ccoli
What cis cthe cbest cway cto cprevent cthe cspread cof cthis cinfection c(E. cColi)?
-All cfood chandlers care crequired cto cwash ctheir chands cthoroughly cafter csneezing.
-All cfood chandlers care crequired cto cwash ctheir chands cthoroughly cafter cusing cthe crestroom.
-All cfood chandlers care crequired cto cclean crestrooms cat cthe cbeginning cof ctheir cshift.
-All cfood chandlers care crequired cto cwear cgloves cto cprotect cthemselves cfrom cany cpotential cbact
cCORRECT cANS✔✔All cfood chandlers care crequired cto cwash ctheir chands cthoroughly cafter cusin
What cis cthe crecommended ccourse cof ctherapy c(for ce. cColi)?
oral cfluids
soft cfood cdiet
intravenous cfluid creplacement
antibiotics c- cCORRECT cANS✔✔oral cfluids
Which ccondition cis cassociated cwith cbacterial cinfection cof cthe cbladder?
pyelonephritis
urethritis
bacteremia
cystitis c- cCORRECT cANS✔✔cystitis
Some cstrains cof cE. ccoli chave c__________ callowing cthem cto cbind cand cthen center cinto cepitheli
fimbriae
flagella
gram-negative ccell cwall
cilia c- cCORRECT cANS✔✔fimbriae
What cis cthe cprimary csource cof cinfection cfor cUTIs?
Sexual cintercourse
Contaminated cdrinking cwater
Fecal ccontamination
Dehydration c- cCORRECT cANS✔✔Fecal ccontamination
Which cdemographic cis cmost clikely cto cdevelop ca curinary ctract cinfection?
