Bio-chemistryyTestybank
BIO 3320Bio-chemistry Test bank
y y y
Contents
Chaptery1 IntroductionytoyBiochemistry 1
Chaptery2 Water 10
Chaptery3 AminoyAcidsyandytheyPrimaryyStructuresyofyProteins 27
Chaptery4 Proteins:yThree-DimensionalyStructureyandyFunction 46
Chaptery5 PropertiesyofyEnzymes 65
Chaptery6 MechanismsyofyEnzymes 85
Chaptery7 CoenzymesyandyVitamins 104
Chaptery8 Carbohydrates 119
Chaptery9 LipidsyandyMembranes 137
Chaptery10 IntroductionytoyMetabolism 153
Chaptery11 Glycolysis 169
Chaptery12 Gluconeogenesis,yTheyPentoseyPhosphateyPathway,
andyGlycogenyMetabolism 185
Chaptery13 TheyCitricyAcidyCycle 199
Chaptery14 ElectronyTransportyandyOxidativeyPhosphorylation 213
Chaptery15 Photosynthesis 227
Chaptery16 LipidyMetabolism 241
Chaptery17 AminoyAcidyMetabolism 256
Chaptery18 NucleotideyMetabolism 269
Chaptery19 NucleicyAcids 284
Chaptery20 DNAyReplication,yRepair,yandyRecombination 300
Chaptery21 TranscriptionyandyRNAyProcessing 315
Chaptery22 ProteinySynthesis 330
Chaptery23 RecombinantyDNAyTechnology 348
, Bio-
chemistryyTestybank
Chapter 1 Introduction to Biochemistry
y y y
1) Whichyelementsyaccounty fory moreythany97%y ofytheyweighty ofymostyorganisms?
A) C,y H,yN,yMg,yO,y S
B) C,y H,yN,yO,yP,yS
C) C,y H,yN
D) Fe,yC,y H,yO,y P
E) Ca2+,y K+,y Na+,y Mg2+,y Cl-
Answer:y B
PageyRef:y Sectiony 2
2) Proteinsyinybiologicaly membranesy mayybe
A) porous.
B) attachedytoytheymembraney surface.
C) spany theymembrane.
D) Allyofytheyabove
E) ByandyCyonly
Answer:y D
PageyRef:y Sectiony 3
3) Whichystatementyabouty celluloseyisyfalse?
A) Ityisytheymostyabundanty polysaccharideyinynature.
B) Itsymonomersy areyjoinedy byyglycosidicybonds.
C) Ityisypresentyinytheystemsyofyfloweringy plants.
D) Theyhydroxyly groupsy ofyneighboringy celluloseymoleculesy interacty toyformy strong,y insolubl
eyfibers.
E) Ityisyay branchedy polymeryofyglucose.
Answer:y E
PageyRef:y Sectiony 3
1
, Bio-
chemistryyTestybank
4) WhenyKeqyofyayreactiony=y1,ythen
A) theyforwardy reactionyisyfasterythany they reversey reaction.
B) they reversey reactionyisyfastery thany theyforwardy reaction.
C) theyforwardyandy reversey reactionyrateyconstantsyarey equal.
D) morey productsyarey formedythany reactants.
E) fewery productsyarey formedythany reactants.
Answer:y C
PageyRef:y Sectiony 4
5) Whichy statementy isytrueyabouty ay reactionywithyanyequilibriumy constant,y Keq,yequaly toy1000?
A) They forwardyrateyconstanty isy1000y timesygreatery thany theyreversey rateyconstant.
B) Theyforwardyrateyconstanty isy3y timesygreatery thany reversey rateyconstant.
C) They forwardyrateyconstanty isy1000ytimesy smallerythanytheyreversey rateyconstant.
D) Theyforwardyrateyconstanty isy3y timesysmallerythany theyreversey rateyconstant.
E) Thereyisynoty enoughy informationy givenytoycompareytheyforwardyandy reversey rateyconstants.
Answer:y A
PageyRef:y Sectiony 4
6) They studyy ofythey energyychangesy duringy metabolicy reactionsy isycalled .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicalyheaty dynamics
Answer:y D
PageyRef:y Sectiony 4
7) Ayspontaneousy chemicaly reactionyalwaysy hasy a change.
A) positivey Gibbʹsyfreey energy
B) negativeyGibbʹsyfreey energy
C) positivey enthalpy
D) negativeyenthalpy
E) positiveyentropy
Answer:y B
PageyRef:y Sectiony 4
2
, Bio-
chemistryyTestybank
8) Prokaryotesyarey valuableytoolsy fory biochemistsy because
A) E.ycoliyisywell-studiedyandytypicalyofyprokaryotes.
B) theyycontainy asymanyygenesy asy eukaryoticy cells.
C) manyyofytheiry chromosomesy arey sequenced.
D) theyyareynoty veryydiverseyorganisms.
E) Allyofytheyabove
Answer:y C
PageyRef:y Sectiony 6
9) Whichy cellulary componenty carriesy outyoxidationy reactions,y someyofywhichy produceyhydroge
nyperoxide?
A) peroxisomes
B) mitochondria
C) chloroplasts
D) lysosomes
E) vacuoles
Answer:y A
PageyRef:y Sectiony 8
10) Whyyisyityimportanty thaty theyenzymesy inylysosomesy areymoreyactiveyaty acidicy pHy thany aty neutr
alypH?
A) Sinceylysosomesy arey primarilyyfoundy inytheystomachyacidyofymammals,y theiry p
Hydependencey allowsy fory maximumyefficiencyyfory theydigestiony ofyfoodstuffs.
B) Ity preventsytheirydiffusionyoutyofytheylysosomes.
C) Itymaximizesytheyinteractiony withytheiry substratesy whichy areyalwaysy bases.
D) Ity preventsythemy fromyaccidentallyydegradingy theymacromoleculesy inytheycytosol.
E) Ity allowsy fory regulationy ofytheiryuptakey byytheymitochondria.
Answer:y D
PageyRef:y Sectiony 8
11) Moleculesy fromylivingy cellsycannoty beysynthesizedy outsidey ofylivingy cells
.yAnswer:y FALSE
PageyRef:y Sectiony 1
12) Fermentationy inytheyabsenceyofycellsydemonstratedythaty metabolicy processesy wereychemicaly i
nynature.
Answer:y TRUE
PageyRef:y Sectiony 1
3
BIO 3320Bio-chemistry Test bank
y y y
Contents
Chaptery1 IntroductionytoyBiochemistry 1
Chaptery2 Water 10
Chaptery3 AminoyAcidsyandytheyPrimaryyStructuresyofyProteins 27
Chaptery4 Proteins:yThree-DimensionalyStructureyandyFunction 46
Chaptery5 PropertiesyofyEnzymes 65
Chaptery6 MechanismsyofyEnzymes 85
Chaptery7 CoenzymesyandyVitamins 104
Chaptery8 Carbohydrates 119
Chaptery9 LipidsyandyMembranes 137
Chaptery10 IntroductionytoyMetabolism 153
Chaptery11 Glycolysis 169
Chaptery12 Gluconeogenesis,yTheyPentoseyPhosphateyPathway,
andyGlycogenyMetabolism 185
Chaptery13 TheyCitricyAcidyCycle 199
Chaptery14 ElectronyTransportyandyOxidativeyPhosphorylation 213
Chaptery15 Photosynthesis 227
Chaptery16 LipidyMetabolism 241
Chaptery17 AminoyAcidyMetabolism 256
Chaptery18 NucleotideyMetabolism 269
Chaptery19 NucleicyAcids 284
Chaptery20 DNAyReplication,yRepair,yandyRecombination 300
Chaptery21 TranscriptionyandyRNAyProcessing 315
Chaptery22 ProteinySynthesis 330
Chaptery23 RecombinantyDNAyTechnology 348
, Bio-
chemistryyTestybank
Chapter 1 Introduction to Biochemistry
y y y
1) Whichyelementsyaccounty fory moreythany97%y ofytheyweighty ofymostyorganisms?
A) C,y H,yN,yMg,yO,y S
B) C,y H,yN,yO,yP,yS
C) C,y H,yN
D) Fe,yC,y H,yO,y P
E) Ca2+,y K+,y Na+,y Mg2+,y Cl-
Answer:y B
PageyRef:y Sectiony 2
2) Proteinsyinybiologicaly membranesy mayybe
A) porous.
B) attachedytoytheymembraney surface.
C) spany theymembrane.
D) Allyofytheyabove
E) ByandyCyonly
Answer:y D
PageyRef:y Sectiony 3
3) Whichystatementyabouty celluloseyisyfalse?
A) Ityisytheymostyabundanty polysaccharideyinynature.
B) Itsymonomersy areyjoinedy byyglycosidicybonds.
C) Ityisypresentyinytheystemsyofyfloweringy plants.
D) Theyhydroxyly groupsy ofyneighboringy celluloseymoleculesy interacty toyformy strong,y insolubl
eyfibers.
E) Ityisyay branchedy polymeryofyglucose.
Answer:y E
PageyRef:y Sectiony 3
1
, Bio-
chemistryyTestybank
4) WhenyKeqyofyayreactiony=y1,ythen
A) theyforwardy reactionyisyfasterythany they reversey reaction.
B) they reversey reactionyisyfastery thany theyforwardy reaction.
C) theyforwardyandy reversey reactionyrateyconstantsyarey equal.
D) morey productsyarey formedythany reactants.
E) fewery productsyarey formedythany reactants.
Answer:y C
PageyRef:y Sectiony 4
5) Whichy statementy isytrueyabouty ay reactionywithyanyequilibriumy constant,y Keq,yequaly toy1000?
A) They forwardyrateyconstanty isy1000y timesygreatery thany theyreversey rateyconstant.
B) Theyforwardyrateyconstanty isy3y timesygreatery thany reversey rateyconstant.
C) They forwardyrateyconstanty isy1000ytimesy smallerythanytheyreversey rateyconstant.
D) Theyforwardyrateyconstanty isy3y timesysmallerythany theyreversey rateyconstant.
E) Thereyisynoty enoughy informationy givenytoycompareytheyforwardyandy reversey rateyconstants.
Answer:y A
PageyRef:y Sectiony 4
6) They studyy ofythey energyychangesy duringy metabolicy reactionsy isycalled .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicalyheaty dynamics
Answer:y D
PageyRef:y Sectiony 4
7) Ayspontaneousy chemicaly reactionyalwaysy hasy a change.
A) positivey Gibbʹsyfreey energy
B) negativeyGibbʹsyfreey energy
C) positivey enthalpy
D) negativeyenthalpy
E) positiveyentropy
Answer:y B
PageyRef:y Sectiony 4
2
, Bio-
chemistryyTestybank
8) Prokaryotesyarey valuableytoolsy fory biochemistsy because
A) E.ycoliyisywell-studiedyandytypicalyofyprokaryotes.
B) theyycontainy asymanyygenesy asy eukaryoticy cells.
C) manyyofytheiry chromosomesy arey sequenced.
D) theyyareynoty veryydiverseyorganisms.
E) Allyofytheyabove
Answer:y C
PageyRef:y Sectiony 6
9) Whichy cellulary componenty carriesy outyoxidationy reactions,y someyofywhichy produceyhydroge
nyperoxide?
A) peroxisomes
B) mitochondria
C) chloroplasts
D) lysosomes
E) vacuoles
Answer:y A
PageyRef:y Sectiony 8
10) Whyyisyityimportanty thaty theyenzymesy inylysosomesy areymoreyactiveyaty acidicy pHy thany aty neutr
alypH?
A) Sinceylysosomesy arey primarilyyfoundy inytheystomachyacidyofymammals,y theiry p
Hydependencey allowsy fory maximumyefficiencyyfory theydigestiony ofyfoodstuffs.
B) Ity preventsytheirydiffusionyoutyofytheylysosomes.
C) Itymaximizesytheyinteractiony withytheiry substratesy whichy areyalwaysy bases.
D) Ity preventsythemy fromyaccidentallyydegradingy theymacromoleculesy inytheycytosol.
E) Ity allowsy fory regulationy ofytheiryuptakey byytheymitochondria.
Answer:y D
PageyRef:y Sectiony 8
11) Moleculesy fromylivingy cellsycannoty beysynthesizedy outsidey ofylivingy cells
.yAnswer:y FALSE
PageyRef:y Sectiony 1
12) Fermentationy inytheyabsenceyofycellsydemonstratedythaty metabolicy processesy wereychemicaly i
nynature.
Answer:y TRUE
PageyRef:y Sectiony 1
3
