Cell Biology Exam Practice Questions and Answers Updated 2026

Cell Biology Exam
Practice Questions and
Answers Updated 2026
CellsBwereBfirstBseenBbyBtheBendBofBtheBsixteenthBcenturyBwithBcompoundBmicrosco
pes.BWhatBcharacterizesBaBcompoundBmicroscope?

a.BItBhasBaBmoveableBstage

b.BItBhasBtwoBlenses

c.BItsBlensBisBdoubleBtheBsizeBofBtheBoriginalBmicroscopes

d.BTheBlensBhasBtwoBdifferentBcolors

e.BTheyBhaveBtwoBdifferentBlightBsourcesB-BAnswerBb.BItBhasBtwoBlenses



WhichBofBtheBfollowingBnumberedBstatementsBpertainBtoBCellBTheory?

1.BAllBorganismsBareBcomposedBofBoneBorBmoreBcells

2.BTheBcellBisBtheBstructuralBunitBofBlife

3.BCellsBcanBariseBonlyBbyBdivisionBfromBaBpreexistingBcell

4.BCellsBdivideBonlyBbyBfission

a.B1

b.B2

c.B3

d.B4

e.B1,B2,BandB3B-BAnswerBe.B1,B2,BandB3



WhichBofBtheBfollowingBcharacteristicsBisB(are)BaBbasicBpropertyBofBcells?

a.BCellsBareBhighlyBcomplexBandBorganized

b.BCellsBpossessBaBgeneticBprogramBandBtheBmeansBtoBuseBit

c.BCellsBareBcapableBofBproducingBmoreBofBthemselves

,d.BCellsBacquireBandButilizeBenergy

e.BAllBofBtheseBareBcorrectB-BAnswerBe.BAllBofBtheseBareBcorrect



WhatBfactorBorBfactorsBdiscoveredBwithBelectronBmicroscopyBdistinguishedBprokaryotic
BfromBeukaryoticBcells?

1.BtheirBsize

2.BtheirBcolor

3.BtheBtypesBofBtheirBinternalBstructuresBorBorganelles

4.BtheirBfragility

a.B1

b.B2

c.B3

d.B4

e.B1BandB3B-BAnswerBe.B1BandB3



WhatBcharacteristicsBdistinguishBprokaryoticBandBeukaryoticBcells?

a.BEukaryotesBhaveBmembrane-boundBorganelles;BprokaryotesBdoBnot

b.BProkaryotesBhaveBrelativelyBlittleBDNA;BeukaryotesBgenerallyBhaveBmuchBmore

c.BEukaryoticBchromosomesBareBlinear;BprokaryoticBchromosomesBareBcircular

d.BProkaryoticBDNABisB"naked"BrelativeBtoBeukaryoticBDNA,BwhichBisBheavilyBchromati
nized

e.BAllBofBtheseBareBcorrectB-BAnswerBe.BAllBofBtheseBareBcorrect



WhatBisBtheBmostBappropriateBunitBofBmeasurementBforBmacromolecularBcomplexesBi
ncludingBribosomesBandBmicrofilaments?

a.Bpicometers

b.Bangstroms

c.Bnanometers

d.Bmicrometers

,e.BcentimetersB-BAnswerBc.Bnanometers



WhichBofBtheseBrepresentBcellsBassimilatedBviaBendosymbioticBevents?

a.BProteobacterialBancestorBofBtheBmitochondrion

b.BCyanobacterialBancestorBofBtheBplastidB(calledBtheBchloroplastBinBplants)

c.BRhodophyteBancestorBofBsomeBsecondaryB(higher-order)BeukaryoticBhosts

d.BChlorophyteBancestorBofBsomeBsecondaryBeukaryoticBhosts

e.BAllBofBtheBaboveB-BAnswerBe.BAllBofBtheBabove



OutsideBofBaBlivingBcell,BtheBvirusBexistsBasBaBparticleBcalledBa(n)B______,BwhichBisBl
ittleBmoreBthanBaBmacromolecularBpackage.B

a.BvirulentB

b.Bvirusette

c.Bvirulant

d.Bvirion

e.BinfectoidB-BAnswerBd.Bvirion



WhichBofBtheseBisBaBtermBforBsphere-shapedBprokaryoticBcells?B

a.BAmoebasB(orBAmoebae)

b.BBacilli

c.BCocci

d.BSpirilli

e.BAllBofBtheBaboveB-BAnswerBc.BCocci



WhatBkindBofBenzymeBisBtheBRasBprotein?

a.BanBATPase

b.BaBkinase

c.BaBphosphodiesterase

, d.BaBGTPase

e.BaBphosphataseB-BAnswerBd.BaBGTPase



HowBisBRasBactivityBturnedBoff?

a.BItBisBturnedBoffBbyBphosphorylation

b.BItBisBturnedBoffBbyBhydrolysisBofBitsBboundBGTPBtoBGDP

c.BItBisBturnedBoffBbyBhydrolysisBofBitsBboundBGDPBtoBGTP

d.BItBisBturnedBoffBbyBanBallostericBinhibitor

e.BItBisBturnedBoffBbyBhydrolysisBofBitsBboundBGTPBtoBGMPB-
BAnswerBb.BItBisBturnedBoffBbyBhydrolysisBofBitsBboundBGTPBtoBGDP



AccessoryBproteinsBthatBbindBtoBinactiveBmonomericBGBproteinsBandBstimulateBdissoci
ationBofBtheBboundBGDPBareBcalled:

a.BGAPs

b.BGEFsB

c.BGDIs

d.BRASps

e.BMAPsB-BAnswerBb.BGEFs



SpecificityBinBMAPBkinaseBpathwaysBisBsometimesBachievedBbyBspatialBlocalizationBofB
theBpathway'sBcomponentBproteins.BSpatialBlocalizationBofBtheseBcomponentsBisBdone
BbyBstructuralB(i.e.,Bnon-enzymatic)BproteinsBcalledB_____________.

a.BsequestrationBproteins

b.BpartitioningBproteins

c.BscaffoldingBproteins

d.BframeworkBproteins

e.BspatialBorganizationBproteinsB-BAnswerBc.BscaffoldingBproteins