,Chapter1.Cellular Biology br
MULTIPLECHOICE
1. Astudentisobservingacellunderthemicroscope.Itisobservedtohavesupercoiled DNAwith
br 1k 1k br 1k br
br histones. Whichofthefollowingwouldalsobeobservedbythestudent?
br
a. Asinglecircularchromosome
b. Anucleus
c. Free-floatingnuclear material 1k br
d. Noorganelles
ANS:B
Thecelldescribedisaeukaryoticcell,soithashistonesandasupercoiledDNAwithin itsnucleus; thus,
1k br br br br 1k 1k br br
thenucleusshouldbeobserved.
br br br
Asinglecircularchromosome ischaracteristicofprokaryoticcells,whichdonothavehistones. br 1k 1k br 1k br
Free-floating nuclearmaterialdescribesaprokaryoticcell,whichwouldnot haveadistinctnucleus.
br 1k br 1k 1k 1k 1k 1k 1k br
Eukaryoticcellshavemembraneboundedcellularcomponentscalledorganelles.Noorganellesdescribes 1k br
br a prokaryotic cell.
1k
2. Anurse isinstructingthestaffabout cellularfunctions.Whichcellularfunction isthenurse 1k br 1k br 1k
br describingwhen anisolated 1k 1k b r b r
b r cellabsorbsoxygenandusesittotransformnutrientstoenergy?
a. Metabolicabsorption
b. Communication
c. Secretion
d. Respiration
,ANS:D
The abilityofthecelltoabsorboxygenreferstothe cells functionofrespiration.
1k br br br 1k
Theabilityofthecell tofunction withinasocietyofcellsreferstoitsfunctionofcommunication.
1k br 1k br
br The abilityofthecelltotakein nutrientsrefersto thecells function ofmetabolic absorption.
1k br 1k br 1k br 1k br br 1k br br
Theabilityofthecelltosynthesizenewsubstancesandsecretetheseelsewherereferstothecellsfunction br
br ofsecretion.
3. Aeukaryoticcell isundergoingDNAreplication.Inwhich regionofthecellwould most of the
1k 1k br br 1k br 1k 1k br 1k
br geneticinformationbecontained?
a. Mitochondria
b. Ribosome
c. Nucleolus
d. Nucleus
ANS:C
Theregionofthecellthatcontainsgeneticmaterial,includinga largeamount ofribonucleicacid,
1k br 1k br br 1k br
br most ofthe DNA,and DNA-binding proteins, isthenucleolus.
1k br br 1k br 1k br br br
Themitochondria isthesiteofcellularrespiration. br 1k
Theribosomesareinvolved inmanufacturing ofproteins withinthecell. 1k 1k 1k
Thenucleuscontainsthenucleolus,anditisthenucleolusthat contains geneticmaterial.
br 1k 1k br br 1k 1k 1k br
4. Thefluid mosaicmodelforbiologicmembranesdescribesmembranebehavior.According tothis
1k 1k 1k br
br model,whichofthefollowingfloatsinglyorasaggregatesin thefluidlipid bilayer?
br br br 1k br br 1k
a. Peripheralmembraneproteins
b. Integralmembraneproteins
, c. Glycoproteins
d. Cell adhesionmolecules
1k br
ANS:B
Integralmembraneproteinsfloat freelyinthefluid lipid bilayer. 1k br 1k br 1k br 1k
Peripheralmembraneproteinsarenot embedded in thelayer,but resideatthesurface.Glycoproteins
br 1k br 1k br 1k br br
actascellsurfacemarkers.
br
Celladhesionmoleculesareonthe outsideofthemembraneandallowcellsto hooktogether.1k br 1k
5. Whichofthefollowingcanbind toplasmamembranereceptors? 1k br
a. Oxygen
b. Ribosomes
c. Amphipathiclipids
d. Ligands
ANS:D
Ligands arespecificmoleculesthatcanbindwithreceptorsonthecellmembrane.Oxygen
1k br 1k 1k br
br movesbydiffusion;itdoesnot bindtoreceptors.br 1k br
Ribosomesmakeproteinsandarenot involved inbinding.
1k 1k 1k 1k 1k 1k
br Amphipathiclipidsareaportionofthecellmembrane.
6. Anurse isreviewingareportfromapatient withmetastaticcancer.Whatfindingwould 1k 1k br
b r supportthediagnosisofmetastaticcancer?Alterationsinextracellular
1k 1k 1k
matrixthatinclude:
br 1k
a. Decreasedfibronectin1k
b. Increasedcollagen
c. Decreasedelastin 1k
MULTIPLECHOICE
1. Astudentisobservingacellunderthemicroscope.Itisobservedtohavesupercoiled DNAwith
br 1k 1k br 1k br
br histones. Whichofthefollowingwouldalsobeobservedbythestudent?
br
a. Asinglecircularchromosome
b. Anucleus
c. Free-floatingnuclear material 1k br
d. Noorganelles
ANS:B
Thecelldescribedisaeukaryoticcell,soithashistonesandasupercoiledDNAwithin itsnucleus; thus,
1k br br br br 1k 1k br br
thenucleusshouldbeobserved.
br br br
Asinglecircularchromosome ischaracteristicofprokaryoticcells,whichdonothavehistones. br 1k 1k br 1k br
Free-floating nuclearmaterialdescribesaprokaryoticcell,whichwouldnot haveadistinctnucleus.
br 1k br 1k 1k 1k 1k 1k 1k br
Eukaryoticcellshavemembraneboundedcellularcomponentscalledorganelles.Noorganellesdescribes 1k br
br a prokaryotic cell.
1k
2. Anurse isinstructingthestaffabout cellularfunctions.Whichcellularfunction isthenurse 1k br 1k br 1k
br describingwhen anisolated 1k 1k b r b r
b r cellabsorbsoxygenandusesittotransformnutrientstoenergy?
a. Metabolicabsorption
b. Communication
c. Secretion
d. Respiration
,ANS:D
The abilityofthecelltoabsorboxygenreferstothe cells functionofrespiration.
1k br br br 1k
Theabilityofthecell tofunction withinasocietyofcellsreferstoitsfunctionofcommunication.
1k br 1k br
br The abilityofthecelltotakein nutrientsrefersto thecells function ofmetabolic absorption.
1k br 1k br 1k br 1k br br 1k br br
Theabilityofthecelltosynthesizenewsubstancesandsecretetheseelsewherereferstothecellsfunction br
br ofsecretion.
3. Aeukaryoticcell isundergoingDNAreplication.Inwhich regionofthecellwould most of the
1k 1k br br 1k br 1k 1k br 1k
br geneticinformationbecontained?
a. Mitochondria
b. Ribosome
c. Nucleolus
d. Nucleus
ANS:C
Theregionofthecellthatcontainsgeneticmaterial,includinga largeamount ofribonucleicacid,
1k br 1k br br 1k br
br most ofthe DNA,and DNA-binding proteins, isthenucleolus.
1k br br 1k br 1k br br br
Themitochondria isthesiteofcellularrespiration. br 1k
Theribosomesareinvolved inmanufacturing ofproteins withinthecell. 1k 1k 1k
Thenucleuscontainsthenucleolus,anditisthenucleolusthat contains geneticmaterial.
br 1k 1k br br 1k 1k 1k br
4. Thefluid mosaicmodelforbiologicmembranesdescribesmembranebehavior.According tothis
1k 1k 1k br
br model,whichofthefollowingfloatsinglyorasaggregatesin thefluidlipid bilayer?
br br br 1k br br 1k
a. Peripheralmembraneproteins
b. Integralmembraneproteins
, c. Glycoproteins
d. Cell adhesionmolecules
1k br
ANS:B
Integralmembraneproteinsfloat freelyinthefluid lipid bilayer. 1k br 1k br 1k br 1k
Peripheralmembraneproteinsarenot embedded in thelayer,but resideatthesurface.Glycoproteins
br 1k br 1k br 1k br br
actascellsurfacemarkers.
br
Celladhesionmoleculesareonthe outsideofthemembraneandallowcellsto hooktogether.1k br 1k
5. Whichofthefollowingcanbind toplasmamembranereceptors? 1k br
a. Oxygen
b. Ribosomes
c. Amphipathiclipids
d. Ligands
ANS:D
Ligands arespecificmoleculesthatcanbindwithreceptorsonthecellmembrane.Oxygen
1k br 1k 1k br
br movesbydiffusion;itdoesnot bindtoreceptors.br 1k br
Ribosomesmakeproteinsandarenot involved inbinding.
1k 1k 1k 1k 1k 1k
br Amphipathiclipidsareaportionofthecellmembrane.
6. Anurse isreviewingareportfromapatient withmetastaticcancer.Whatfindingwould 1k 1k br
b r supportthediagnosisofmetastaticcancer?Alterationsinextracellular
1k 1k 1k
matrixthatinclude:
br 1k
a. Decreasedfibronectin1k
b. Increasedcollagen
c. Decreasedelastin 1k
