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REA MCAT Multiple Choice Q-s With Correct Answers
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REA MCAT Multiple Choice Q's WithCorrect Answers
Enzymes nnare: nn
a. nnproteins
b. nncatalysts
c. nncarbohydrates
d. nnboth nnproteins nnand nncatalysts nn- nnANSWER: nn✔ nnD. nnEnzymes nnare nnproteins nnthat nnact nnas nncatalysts.
nnCarbohydrates nnare nnnot nnproteins, nnand nntherefore nncannot nnbe nnenzymes.
Organisms nncan nncontrol nnall nnof nnthe nnfollowing nnEXCEPT:
a. nnlocation nnof nnenzymes
b. nntype nnof nnenzymes
c. nnamount nnof nnenzymes
d. nnactivity nnof nnenzymes nn- nnANSWER: nn✔ nnB. nnOrganisms nncontrol nnthe nnactivity nnof nnenzymes nnby
nnchanging nnor nnblocking nnactive nnsites. nnLocation nnand nnamount nnof nnenzymes nnmay nnbe nncontrolled
nnthrough nnfeedback. nnTypes nnof nnenzymes nnare nndetermined nngenetically nnand nncannot nnbe nnaltered.
In nnfeedback nninhibition nnof nnmetabolic nnpathways, nnwhich nnare nncontrolled nndirectly?
a. nnend nnpdts
b. nnmetabolites
c. nnenzymes
d. nnprecursor nnmolecules nn- nnANSWER: nn✔ nnC. nnIn nnfeedback nninhibition nnthe nnflow nnof nnmetabolites nnis
nnoften nnregulated nnby nncontrolling nnthe nnactivity nnof nnkey nnenzymes nnin nna nnpathway. nnUsually, nnthe nnfirst
nnenzyme nnin nna nnmetabolic nnpathway nnis nncontrolled nnby nnthe nnend nnproduct nnof nnthe nnpathway.
Glycolysis nndoes nnNOT:
a. nnoccur nnin nnthe nncytoplasm
b. nnrequire nnoxygen
,c. nnproduce nnATP
d. nnbreak nndown nnglucose nn- nnANSWER: nn✔ nnB. nnGlycolysis nnis nnthe nnseries nnof nnmetabolic nnreactions nnby
nnwhich nnglucose nnis nnconverted nnto nnpyruvate nn(a nn3-C nnsugar) nnwith nnthe nnconcurrent nnformation nnof nnATP.
nnGlycolysis nnoccurs nnin nnthe nncytoplasm nnof nnthe nncell nnand nnfor nnthis nnprocess nnthe nnpresence nnof nnoxygen
nnis nnunnecessary.
In nnthe nnKrebs nnCycle, nnall nnof nnthe nnfollowing nnoccur nnEXCEPT:
a. nnoxidation nnof nnsuccinate
b. nnformation nnof nnFADH2
c. nnformation nnof nnNADH
d. nntransformation nnof nnNADH nnto nnNAD nn- nnANSWER: nn✔ nnD. nnNADH nnis nnconverted nnto nnNAD nnduring
nnoxidative nnphosphorylation, nnwhich nnyields nn3 nnATP.
The nnratio nnof nnATP nnproduced nnaerobically nnto nnanaerobically nnby nnthe nnoxidation nnof nnone nnmolecule nnof
nnglucose nnis nn
a. nn2:1
b. nn1:2
c. nn1:18
d. nn18:1 nn- nnANSWER: nn✔ nnD. nnThe nnaerobic nnproduction nnof nnATP nninvolves nnthe nnKrebs nncycle nnand nnthe
nnoxidation nnof nnglucose. nnThe nnanaerobic nnproduction nnof nnATP nntakes nnplace nnduring nnglycolysis. nnThe
nncitric nnacid nncycle nnproduces nn34 nnATP's nnand nnthe nnoxidation nnof nnglucose nnproduces nn2. nnThis nnmakes nnthe
nntotal nnnumber nnof nnATP's nnproduced nnduring nnaerobic nnprocesses nn36. nnGlycolysis nnyields nn2 nnATP's. nnThe
nnnet nnratio nnof nnaerobic nnATP nnto nnanaerobic nnATP nnis nn36:2, nnwhich nnreduces nnto nn18:1.
Nitrous nnacid nnconverts nncytosine nnto nnuracil nnby nndeamination. nnThis nntype nnof nnconversion nnin nnone nnDNA
nnstrand nnwould nnlead nnto nna nnchange nnin nnthe nncomplementary nnbase nnin nnthe nnother nnstrand nnto
a. nnadenine
b. nncytosine
c. nnthymine
d. nnguanine nn- nnANSWER: nn✔ nnA. nnCytosine nnnormally nnbinds nnto nnguanine nnand nnuracil nnnormally nnbinds nnto
nnadenine. nnA nnconversion nnof nncytosine nnto nnuracil nnwould nnlead nnto nna nnconversion nnof nnguanine nnto
nnadenine nnin nnthe nncomplementary nnstrand. nnThus nna nnCG nnto nnAU nnevent nnhas nnoccurred.
, Viruses nndiffer nnfrom nnliving nnorganisms nnbecause
a. nnviruses nnpossess nnno nnbounding nnmembrane
b. nnviruses nnlack nnall nnmetabolic nnmachinery
c. nnviruses nnlack nnall nnreproductive nnmachinery
d. nnall nnof nnthe nnabove nn- nnANSWER: nn✔ nnD. nnViruses nndo nnnot nnhave nnany nnmembranes nnbecause nnthey
nnhave nnno nnneed nnto nntake nnin nnor nnexpel nnmaterial. nnViruses nnlack nnall nnmetabolic nnmachinery nnand nndo
nnnot nnproduce nnATP nnbecause nnthey nndo nnnot nnperform nnenergy nnrequiring nnprocesses. nnViruses nndo
nnpossess nneither nnDNA nnor nnRNA, nnbut nncannot nnindependently nnreproduce. nnThey nnmust nnrely nnon nnhost
nncells nnfor nnreproductive nnmachinery nnand nncomponents.
Moderate nnviruses nnmay
a. nnreplace nnDNA nnonly nnwhen nnthe nnhost nnreplicates
b. nninduce nntumors
c. nncause nnimmediate nnlysis nnof nninfected nnbacteria
d. nnhave nnboth nnDNA nnand nnRNA nn- nnANSWER: nn✔ nnA. nnIn nnmoderate nnviruses nnthe nnphage nnDNA nnis
nnincorporated nndirectly nninto nnthe nnhost nnchromosome, nnand nnthus nnreplicates nnonly nnwhen nnthe nnhost
nndoes. nnRNA nnretroviruses nnmay nninduce nntumors. nnMost nnviruses, nnwith nnthe nnexception nnof nnmoderate
nnones, nncause nnimmediate nnlysis nnof nninfected nnbacteria. nnViruses nnmay nncontain nneither nnDNA nnor nnRNA,
nnnot nnboth.
Which nnof nnthe nnfollowing nnstructures nnis nnfound nnin nna nnbacterial nncell?
a. nnGolgi nnapparatus
b. nnNuclear nnmembrane
c. nnribosomes
d. nnMitochondrion nn- nnANSWER: nn✔ nnC. nnUnlike nneukaryotes, nnbacterial nncells nnlack nnGolgi nnapparatus,
nnendoplasmic nnreticulum, nnmitochondria nnand nna nnnuclear nnmembrane. nnThe nnlack nnof nnan nnendoplasmic
nnreticulum nnmeans nnthat nnthe nnribosomes nnare nnfree.
In nntransduction, nna:
a. nnmale nnchromosome nnis nninjected nninto nna nnfemale nncell
b. nnfemale nnchromosome nnis nninjected nninto nna nnmale nncell
c. nnbacteriophage nntransfers nngenetic nnmaterial nnbetween nnbacteria
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