Bio-chemistrygTestgbank
BIO 3320Bio-chemistry Test bank
g g g
Contents
Chapterg1 IntroductiongtogBiochemistry 1
Chapterg2 Water 10
Chapterg3 AminogAcidsgandgthegPrimarygStructuresgofgProteins 27
Chapterg4 Proteins:gThree-DimensionalgStructuregandgFunction 46
Chapterg5 PropertiesgofgEnzymes 65
Chapterg6 MechanismsgofgEnzymes 85
Chapterg7 CoenzymesgandgVitamins 104
Chapterg8 Carbohydrates 119
Chapterg9 LipidsgandgMembranes 137
Chapterg10 IntroductiongtogMetabolism 153
Chapterg11 Glycolysis 169
Chapterg12 Gluconeogenesis,gThegPentosegPhosphategPathway,
andgGlycogengMetabolism 185
Chapterg13 ThegCitricgAcidgCycle 199
Chapterg14 ElectrongTransportgandgOxidativegPhosphorylation 213
Chapterg15 Photosynthesis 227
Chapterg16 LipidgMetabolism 241
Chapterg17 AminogAcidgMetabolism 256
Chapterg18 NucleotidegMetabolism 269
Chapterg19 NucleicgAcids 284
Chapterg20 DNAgReplication,gRepair,gandgRecombination 300
Chapterg21 TranscriptiongandgRNAgProcessing 315
Chapterg22 ProteingSynthesis 330
Chapterg23 RecombinantgDNAgTechnology 348
, Bio-
chemistrygTestgbank
Chapter 1 Introduction to Biochemistry
g g g
1) Whichgelementsgaccountg forg moregthang97%g ofgthegweightg ofgmostgorganisms?
A) C,g H,gN,gMg,gO,g S
B) C,g H,gN,gO,gP,gS
C) C,gH,gN
D) Fe,gC,g H,gO,g P
E) Ca2+,g K+,g Na+,g Mg2+,g Cl-
Answer:g B
PagegRef:g Sectiong 2
2) Proteinsgingbiologicalgmembranesg maygbe
A) porous.
B) attachedgtogthegmembraneg surface.
C) spang thegmembrane.
D) Allg ofgthegabove
E) BgandgCgonly
Answer:g D
PagegRef:g Sectiong 3
3) Whichgstatementgaboutg cellulosegisgfalse?
A) Itgisgthegmostgabundantg polysaccharidegingnature.
B) Itsgmonomersg aregjoinedg bygglycosidicg bonds.
C) Itgisgpresentg ingthegstemsgofgfloweringg plants.
D) Theghydroxylggroupsg ofgneighboringgcellulosegmoleculesginteractgtogformgstrong,ginsolu
blegfibers.
E) Itgisgag branchedg polymerg ofgglucose.
Answer:g E
PagegRef:g Sectiong 3
1
, Bio-
chemistrygTestgbank
4) WhengKeqgofgagreactiong=g1,gthen
A) thegforwardg reactiongisgfastergthang thegreverseg reaction.
B) thegreverseg reactiongisgfasterg thang thegforwardg reaction.
C) thegforwardgandg reverseg reactiongrategconstantsgareg equal.
D) moreg productsgaregformedgthang reactants.
E) fewerg productsgaregformedgthang reactants.
Answer:g C
PagegRef:g Sectiong 4
5) Whichgstatementgisgtruegaboutg ag reactiongwithgangequilibriumgconstant,g Keq,gequalg tog1000?
A) Thegforwardgrategconstantg isg1000g timesggreaterg thang thegreversegrategconstant.
B) Thegforwardgrategconstantg isg3g timesggreaterg thang reverseg rategconstant.
C) Thegforwardgrategconstantg isg1000gtimesgsmallergthangthegreverseg rategconstant.
D) Thegforwardgrategconstantg isg3g timesgsmallergthang thegreversegrategconstant.
E) Theregisgnotg enoughg informationg givengtogcomparegthegforwardgandg reverseg rategconstant
s.
Answer:g A
PagegRef:g Sectiong 4
6) Thegstudyg ofgtheg energyg changesg duringg metabolicgreactionsg isgcalled .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicalgheatg dynamics
Answer:g D
PagegRef:g Sectiong 4
7) Agspontaneousg chemicalg reactiongalwaysg hasg a change.
A) positivegGibbʹsgfreegenergy
B) negativegGibbʹsgfreeg energy
C) positiveg enthalpy
D) negativegenthalpy
E) positivegentropy
Answer:g B
PagegRef:g Sectiong 4
2
, Bio-
chemistrygTestgbank
8) Prokaryotesgareg valuablegtoolsg forg biochemistsgbecause
A) E.gcoligisgwell-studiedg andgtypicalgofgprokaryotes.
B) theygcontaing asgmanyggenesg asg eukaryoticg cells.
C) manygofgtheirgchromosomesg aregsequenced.
D) theygaregnotg verygdiversegorganisms.
E) Allg ofgthegabove
Answer:g C
PagegRef:g Sectiong 6
9) Whichgcellulargcomponentgcarriesgoutgoxidationgreactions,gsomegofgwhichgproduceghydrog
engperoxide?
A) peroxisomes
B) mitochondria
C) chloroplasts
D) lysosomes
E) vacuoles
Answer:g A
PagegRef:g Sectiong 8
10) Whygisgitgimportantgthatgthegenzymesginglysosomesgaregmoregactivegatgacidicg pHgthangatgne
utralgpH?
A) Sinceglysosomesgaregprimarilygfoundgingthegstomachgacidgofgmammals,gtheirg
pHgdependencegallowsgforgmaximumgefficiencygforgthegdigestiongofgfoodstuf
fs.
B) Itg preventsgtheirgdiffusiongoutgofgtheglysosomes.
C) Itgmaximizesgtheginteractiong withgtheirg substratesg whichg aregalwaysg bases.
D) Itg preventsgthemg fromgaccidentallygdegradingg thegmacromoleculesg ingthegcytosol.
E) Itg allowsg forg regulationg ofgtheirguptakeg bygthegmitochondria.
Answer:g D
PagegRef:g Sectiong 8
11) Moleculesgfromglivinggcellsgcannotg begsynthesizedg outsidegofglivingg ce
lls.gAnswer:g FALSE
PagegRef:g Sectiong 1
12) Fermentationgingthegabsencegofgcellsgdemonstratedgthatg metabolicgprocessesgweregchemical
gingnature.
Answer:g TRUE
PagegRef:g Sectiong 1
3
BIO 3320Bio-chemistry Test bank
g g g
Contents
Chapterg1 IntroductiongtogBiochemistry 1
Chapterg2 Water 10
Chapterg3 AminogAcidsgandgthegPrimarygStructuresgofgProteins 27
Chapterg4 Proteins:gThree-DimensionalgStructuregandgFunction 46
Chapterg5 PropertiesgofgEnzymes 65
Chapterg6 MechanismsgofgEnzymes 85
Chapterg7 CoenzymesgandgVitamins 104
Chapterg8 Carbohydrates 119
Chapterg9 LipidsgandgMembranes 137
Chapterg10 IntroductiongtogMetabolism 153
Chapterg11 Glycolysis 169
Chapterg12 Gluconeogenesis,gThegPentosegPhosphategPathway,
andgGlycogengMetabolism 185
Chapterg13 ThegCitricgAcidgCycle 199
Chapterg14 ElectrongTransportgandgOxidativegPhosphorylation 213
Chapterg15 Photosynthesis 227
Chapterg16 LipidgMetabolism 241
Chapterg17 AminogAcidgMetabolism 256
Chapterg18 NucleotidegMetabolism 269
Chapterg19 NucleicgAcids 284
Chapterg20 DNAgReplication,gRepair,gandgRecombination 300
Chapterg21 TranscriptiongandgRNAgProcessing 315
Chapterg22 ProteingSynthesis 330
Chapterg23 RecombinantgDNAgTechnology 348
, Bio-
chemistrygTestgbank
Chapter 1 Introduction to Biochemistry
g g g
1) Whichgelementsgaccountg forg moregthang97%g ofgthegweightg ofgmostgorganisms?
A) C,g H,gN,gMg,gO,g S
B) C,g H,gN,gO,gP,gS
C) C,gH,gN
D) Fe,gC,g H,gO,g P
E) Ca2+,g K+,g Na+,g Mg2+,g Cl-
Answer:g B
PagegRef:g Sectiong 2
2) Proteinsgingbiologicalgmembranesg maygbe
A) porous.
B) attachedgtogthegmembraneg surface.
C) spang thegmembrane.
D) Allg ofgthegabove
E) BgandgCgonly
Answer:g D
PagegRef:g Sectiong 3
3) Whichgstatementgaboutg cellulosegisgfalse?
A) Itgisgthegmostgabundantg polysaccharidegingnature.
B) Itsgmonomersg aregjoinedg bygglycosidicg bonds.
C) Itgisgpresentg ingthegstemsgofgfloweringg plants.
D) Theghydroxylggroupsg ofgneighboringgcellulosegmoleculesginteractgtogformgstrong,ginsolu
blegfibers.
E) Itgisgag branchedg polymerg ofgglucose.
Answer:g E
PagegRef:g Sectiong 3
1
, Bio-
chemistrygTestgbank
4) WhengKeqgofgagreactiong=g1,gthen
A) thegforwardg reactiongisgfastergthang thegreverseg reaction.
B) thegreverseg reactiongisgfasterg thang thegforwardg reaction.
C) thegforwardgandg reverseg reactiongrategconstantsgareg equal.
D) moreg productsgaregformedgthang reactants.
E) fewerg productsgaregformedgthang reactants.
Answer:g C
PagegRef:g Sectiong 4
5) Whichgstatementgisgtruegaboutg ag reactiongwithgangequilibriumgconstant,g Keq,gequalg tog1000?
A) Thegforwardgrategconstantg isg1000g timesggreaterg thang thegreversegrategconstant.
B) Thegforwardgrategconstantg isg3g timesggreaterg thang reverseg rategconstant.
C) Thegforwardgrategconstantg isg1000gtimesgsmallergthangthegreverseg rategconstant.
D) Thegforwardgrategconstantg isg3g timesgsmallergthang thegreversegrategconstant.
E) Theregisgnotg enoughg informationg givengtogcomparegthegforwardgandg reverseg rategconstant
s.
Answer:g A
PagegRef:g Sectiong 4
6) Thegstudyg ofgtheg energyg changesg duringg metabolicgreactionsg isgcalled .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicalgheatg dynamics
Answer:g D
PagegRef:g Sectiong 4
7) Agspontaneousg chemicalg reactiongalwaysg hasg a change.
A) positivegGibbʹsgfreegenergy
B) negativegGibbʹsgfreeg energy
C) positiveg enthalpy
D) negativegenthalpy
E) positivegentropy
Answer:g B
PagegRef:g Sectiong 4
2
, Bio-
chemistrygTestgbank
8) Prokaryotesgareg valuablegtoolsg forg biochemistsgbecause
A) E.gcoligisgwell-studiedg andgtypicalgofgprokaryotes.
B) theygcontaing asgmanyggenesg asg eukaryoticg cells.
C) manygofgtheirgchromosomesg aregsequenced.
D) theygaregnotg verygdiversegorganisms.
E) Allg ofgthegabove
Answer:g C
PagegRef:g Sectiong 6
9) Whichgcellulargcomponentgcarriesgoutgoxidationgreactions,gsomegofgwhichgproduceghydrog
engperoxide?
A) peroxisomes
B) mitochondria
C) chloroplasts
D) lysosomes
E) vacuoles
Answer:g A
PagegRef:g Sectiong 8
10) Whygisgitgimportantgthatgthegenzymesginglysosomesgaregmoregactivegatgacidicg pHgthangatgne
utralgpH?
A) Sinceglysosomesgaregprimarilygfoundgingthegstomachgacidgofgmammals,gtheirg
pHgdependencegallowsgforgmaximumgefficiencygforgthegdigestiongofgfoodstuf
fs.
B) Itg preventsgtheirgdiffusiongoutgofgtheglysosomes.
C) Itgmaximizesgtheginteractiong withgtheirg substratesg whichg aregalwaysg bases.
D) Itg preventsgthemg fromgaccidentallygdegradingg thegmacromoleculesg ingthegcytosol.
E) Itg allowsg forg regulationg ofgtheirguptakeg bygthegmitochondria.
Answer:g D
PagegRef:g Sectiong 8
11) Moleculesgfromglivinggcellsgcannotg begsynthesizedg outsidegofglivingg ce
lls.gAnswer:g FALSE
PagegRef:g Sectiong 1
12) Fermentationgingthegabsencegofgcellsgdemonstratedgthatg metabolicgprocessesgweregchemical
gingnature.
Answer:g TRUE
PagegRef:g Sectiong 1
3
