Principles of Biochemistry 4th Edition Test bank by (Horton) latest 2024 ISBN 9780136217152 ALL CHAPTERS COVERED.pdf

Chapter 1 Introduction to Biochemistry
n n n


Horton: Principles Of Biochemistry 4th Edition Test Bank
n n n n n n n




1) Wohlernshowed n that n anchemicaln foundnonlyninnlivingnorganismsn cann ben madenfromn inorganicn s
ubstancesn whenn hen synthesized n .
A) Ammoniumn cyanate
B) Aminon acids
C) Urea
D) Uricnacid
n Answer:n C

PagenRef:n Sectionn 1-1

2) Then lock-and-keyntheoryn described n then actionn of
A) enzymesn asn keysn that n fit n different n chemicals.
B) substratesn asn keysn that n fit n different n enzymes.
C) enzymesn asn locksn that n fit n othern enzymes.
D) substratesnasnlocksnthat nfit ndifferent nenzymes.n
Answer:n B
PagenRef:n Sectionn 1-1

3) Accordingnton Crick'sn CentralnDogmanof nmolecularn Biology,n therencann benNO ntransfern of n i
nformationn from
A) DNA n ton RNA.
B) RNA n ton RNA.
C) RNA n ton protein.
D) proteinntonRNA.n
Answer:n D
PagenRef:n Sectionn 1-1

4) What n isn then correct n ordern inn whichn thesen keynbreakthroughsn inn biochemistryn occurred?
I. Watsonn and n Crickn DNAn structure
II. CricknCentraln dogma
III. Avery,n MacLeod n and n McCartynDNA n workn onn Streptococcus
IV. Widespread n usen of n computers
A) I,n II,n III,n IV
B) III,n I,n II,n IV
C) II,n I,n III,n IV
D) IV,nIII,n I,n II
Answer:n B
PagenRef:n Sectionn 1-1

,5) Whichn elementsn account n forn moren thann 97%n of n then weight n of n most n organisms?
A) C,n H,n N,n Mg,n O,n S
B) C,n H,n N,n O,n P,n S
C) C,n H,n N
D) Fe,n C,n H,n O,n P
E) Ca2+,n K+,n Na+,n Mg2+,n Cl-
Answer:n B
PagenRef:n Sectionn 1-2

6) Whichn linkage(s)n occurn extensivelyninn nucleotides?
A) Amide.
B) Phosphoanhydride.
C) Phosphaten ester.
D) Ether.
E) BothnBnand nCnabove.n
Answer:n E
PagenRef:n Sectionn 1-2

7) Whichn functionaln groupn isn shown?




A) Primaryn amine.
B) Acyl.
C) Amide.
D) Anhydride.
E) Nitrile.n
Answer:n C
PagenRef:n Sectionn 1-2

8) Proteinsn inn biologicaln membranesn maynbe
A) porous.
B) attached n ton then membranen surface.
C) spann then membrane.
D) alln of n then above.
E) Bnand nCnonly.n
Answer:n D
PagenRef:n Sectionn 1-3

,9) A n dipeptiden formsn whenn an functionaln
groupnof nonenaminonacid n reactsnwithnthen functionaln
groupn of n anothern aminon acid n ton formn an bond.
A) carboxylate,n amino,n double
B) carboxylate,n amino,n enzyme
C) amino,n carboxylate,n phosphate
D) amino,ncarboxylate,npeptiden
Answer:n D
PagenRef:n Sectionn 1-3

10) Sugarsn suchn asn glucosen aren monomersn of n polysaccharidesn that n aren linked n togethern whenn co
valent n bondsn formn betweenn onen
groupnof nonensugarntonthensamengroupnonnanothern sugar.
A) ester
B) carboxyl
C) amino
D) hydroxyl
n Answer:n D

PagenRef:n Sectionn 1-3

11) Whichn statement n about n cellulosen isn false?
A) It n isn then most n abundant n polysacchariden inn nature.
B) Itsn monomersn aren joined n byn glycosidicn bonds.
C) It n isn present n inn then stemsn of n floweringn plants.
D) Thenhydroxyln groupsn of nneighboringncellulosen moleculesninteract nton formnstrong,ninsolublen f
ibers.
E) It nisnanbranched npolymernof nglucose.n
Answer:n E
PagenRef:n Sectionn 1-3

12) Whenn Keqn of n an reactionn =n 1,n then
A) then forward n reactionn isn fastern thann then reversen reaction.
B) then reversen reactionn isn fastern thann then forward n reaction.
C) thenforward n and n reversen reactionn raten constantsn aren equal.
D) moren productsn aren formed n thann reactants.
E) fewernproductsnarenformed nthannreactants.n
Answer:n C
Pagen Ref:n Sectionn 1-4

13) Most n of n then energyn required n forn lifen onn Earthn isn supplied n byn .
A) geothermalnenergy
B) then sun
C) cosmicn radiation
D) then conversionn of n ADPn ton ATP
E) mechanicalnenergy
n Answer:n B

PagenRef:n Sectionn 1-4

, 14) Whichn statement n isn truen about n then Gibb'sn freen energynof n an reaction?
A) It n isn dependent n onn then concentrationsn of n bothn productsn and n reactants.
B) It n isn dependent n onlynonn then concentrationsn of n then reactants.
C) It n isn dependent n onlynonn then concentrationsn of n then products.
D) It nisnnot n dependentnonnthen concentrationsnof neithernthenproductsnornreactants.n
Answer:n A
PagenRef:n Sectionn 1-4

15) Whichn statement n isn truen about n an reactionn withn ann equilibriumn constant,n Keq,n equaln ton 1000?
A) Thenforward n raten constant n isn 1000n timesn greatern thann then reversen raten constant.
B) Then forward n raten constant n isn 3n timesn greatern thann reversen raten constant.
C) Then forward n raten constant n isn 1000n timesn smallern thann then reversen raten constant.
D) Then forward n raten constant n isn 3n timesn smallern thann then reversen raten constant.
E) Therenisn not n enoughn informationn givenn toncomparen thenforward n and n reversenraten constants.n
Answer:n A
PagenRef:n Sectionn 1-4

16) If n an reactionn isn at n equilibrium,n what n isn then freen energynchange?
A) It n isn alwaysn positive.
B) It n isn alwaysn negative.
C) It n could n ben eithern positiven orn negativen dependingn onn then reaction.
D) It nequalsnzero.
n Answer:n D

PagenRef:n Sectionn 1-4

17) Whichn statement n isn true?
A) If n DG n isn negative,n thenn then raten of n then reactionn willn ben fast.
B) If n DG n isn positive,n thenn then raten of n then reactionn willn ben fast.
C) If n DG n isn negative,n thenn then raten of n then reactionn willn ben slow.
D) If n DG n isn positive,n thenn then raten of n then reactionn willn ben slow.
E) Thenreactionnratenisnindependent nof nDG.n
Answer:n E
PagenRef:n Sectionn 1-4

18) Then studyn of n then energyn changesn duringn metabolicn reactionsn isn called n .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicalnheat ndynamicsn
Answer:n D
PagenRef:n Sectionn 1-4