Principles of Biochemistry 4th Edition Test bank by (Horton) latest 2025 ISBN:9780136217152 ALL CHAPTERS COVERED

Chapter 1 Introduction to Biochemistry
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Horton: Principles Of Biochemistry 4th Edition Test Bank
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1) Wohlerushoweduthatuauchemicalufounduonlyuinulivinguorganismsucanubeumadeufromuinorganicus
ubstancesuwhenuheusynthesized .
A) Ammoniumucyanate
B) Aminouacids
C) Urea
D) Uricuacidu
Answer:u C
PageuRef:uSectionu1-1

2) Theulock-and-keyutheoryudescribedutheuactionuof
A) enzymesuasukeysuthatufitudifferentuchemicals.
B) substratesuasukeysuthatufitudifferentuenzymes.
C) enzymesuasulocksuthatufituotheruenzymes.
D) substratesuasulocksuthatufitudifferentuenzymes.u
Answer:u B
PageuRef:uSectionu1-1

3) AccordingutouCrick'suCentraluDogmauofumolecularuBiology,uthereucanubeuNOutransferuofui
nformationufrom
A) DNAutouRNA.
B) RNAutouRNA.
C) RNAutouprotein.
D) proteinutouRNA.u
Answer:u D
PageuRef:uSectionu1-1

4) Whatuisutheucorrectuorderuinuwhichutheseukeyubreakthroughsuinubiochemistryuoccurred?
I. WatsonuanduCrickuDNAustructure
II. CrickuCentraludogma
III. Avery,uMacLeoduanduMcCartyuDNAuworkuonuStreptococcus
IV. Widespreaduuseuofucomputers
A) I,uII,uIII,uIV
B) III,uI,uII,uIV
C) II,uI,uIII,uIV
D) IV,uIII,uI,uIIu
Answer:u B
PageuRef:uSectionu1-1

,5) Whichuelementsuaccountuforumoreuthanu97%uofutheuweightuofumostuorganisms?
A) C,uH,uN,uMg,uO,uS
B) C,uH,uN,uO,uP,uS
C) C,uH,uN
D) Fe,uC,uH,uO,uP
E) Ca2+,uK+,uNa+,uMg2+,uCl-
uAnswer:u B


PageuRef:uSectionu1-2

6) Whichulinkage(s)uoccuruextensivelyuinunucleotides?
A) Amide.
B) Phosphoanhydride.
C) Phosphateuester.
D) Ether.
E) BothuBuanduCuabove.u
Answer:u E
PageuRef:uSectionu1-2

7) Whichufunctionalugroupuisushown?




A) Primaryuamine.
B) Acyl.
C) Amide.
D) Anhydride.
E) Nitrile.u
Answer:u C
PageuRef:uSectionu1-2

8) Proteinsuinubiologicalumembranesumayube
A) porous.
B) attachedutoutheumembraneusurface.
C) spanutheumembrane.
D) alluofutheuabove.
E) BuanduCuonly.u
Answer:u D
PageuRef:uSectionu1-3

,9) Audipeptideuformsuwhenuaufunctional
groupuofuoneuaminouacidureactsuwithutheufunctional
groupuofuanotheruaminouacidutouformua bond.
A) carboxylate,uamino,udouble
B) carboxylate,uamino,uenzyme
C) amino,ucarboxylate,uphosphate
D) amino,ucarboxylate,upeptideu
Answer:u D
PageuRef:uSectionu1-3

10) Sugarsusuchuasuglucoseuareumonomersuofupolysaccharidesuthatuareulinkedutogetheruwhenuco
valentubondsuformubetweenuone
groupuofuoneusugarutoutheusameugroupuonuanotherusugar.
A) ester
B) carboxyl
C) amino
D) hydroxylu
Answer:u D
PageuRef:uSectionu1-3

11) Whichustatementuaboutucelluloseuisufalse?
A) Ituisutheumostuabundantupolysaccharideuinunature.
B) Itsumonomersuareujoinedubyuglycosidicubonds.
C) Ituisupresentuinutheustemsuofufloweringuplants.
D) Theuhydroxylugroupsuofuneighboringucelluloseumoleculesuinteractutouformustrong,uinsolubleuf
ibers.
E) Ituisuaubranchedupolymeruofuglucose.u
Answer:u E
PageuRef:uSectionu1-3

12) WhenuKequofuaureactionu=u1,uthen
A) theuforwardureactionuisufasteruthanutheureverseureaction.
B) theureverseureactionuisufasteruthanutheuforwardureaction.
C) theuforwarduandureverseureactionurateuconstantsuareuequal.
D) moreuproductsuareuformeduthanureactants.
E) feweruproductsuareuformeduthanureactants.u
Answer:u C
PageuRef:uSectionu1-4

13) MostuofutheuenergyurequireduforulifeuonuEarthuisusupplieduby .
A) geothermaluenergy
B) theusun
C) cosmicuradiation
D) theuconversionuofuADPutouATP
E) mechanicaluenergyu
Answer:u B
PageuRef:uSectionu1-4

, 14) WhichustatementuisutrueuaboututheuGibb'sufreeuenergyuofuaureaction?
A) Ituisudependentuonutheuconcentrationsuofubothuproductsuandureactants.
B) Ituisudependentuonlyuonutheuconcentrationsuofutheureactants.
C) Ituisudependentuonlyuonutheuconcentrationsuofutheuproducts.
D) Ituisunotudependentuonutheuconcentrationsuofueitherutheuproductsuorureactants.u
Answer:u A
PageuRef:uSectionu1-4

15) Whichustatementuisutrueuaboutuaureactionuwithuanuequilibriumuconstant,uKeq,uequalutou1000?
A) Theuforwardurateuconstantuisu1000utimesugreateruthanutheureverseurateuconstant.
B) Theuforwardurateuconstantuisu3utimesugreateruthanureverseurateuconstant.
C) Theuforwardurateuconstantuisu1000utimesusmalleruthanutheureverseurateuconstant.
D) Theuforwardurateuconstantuisu3utimesusmalleruthanutheureverseurateuconstant.
E) Thereuisunotuenoughuinformationugivenutoucompareutheuforwarduandureverseurateuconstants.u
Answer:u A
PageuRef:uSectionu1-4

16) Ifuaureactionuisuatuequilibrium,uwhatuisutheufreeuenergyuchange?
A) Ituisualwaysupositive.
B) Ituisualwaysunegative.
C) Itucouldubeueitherupositiveuorunegativeudependinguonutheureaction.
D) Ituequalsuzero.u
Answer:u D
PageuRef:uSectionu1-4

17) Whichustatementuisutrue?
A) IfuDGuisunegative,uthenutheurateuofutheureactionuwillubeufast.
B) IfuDGuisupositive,uthenutheurateuofutheureactionuwillubeufast.
C) IfuDGuisunegative,uthenutheurateuofutheureactionuwillubeuslow.
D) IfuDGuisupositive,uthenutheurateuofutheureactionuwillubeuslow.
E) TheureactionurateuisuindependentuofuDG.u
Answer:u E
PageuRef:uSectionu1-4

18) Theustudyuofutheuenergyuchangesuduringumetabolicureactionsuisucalled .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicaluheatudynamicsu
Answer:u D
PageuRef:uSectionu1-4