Chapter 1 Introduction to Biochemistry
m m m
Horton: Principles Of Biochemistry 4th Edition Test Bank
m m m m m m m
1) Wohlermshowed mthat mamchemicalmfound monlyminmlivingmorganismsmcanmbemmademfromminorga
nicmsubstancesmwhenmhemsynthesized m .
A) Ammoniummcyanate
B) Aminomacids
C) Urea
D) Uricmaci
d mAnswer:m
C
PagemRef:mSectionm1-1
2) Themlock-and-keymtheorymdescribed mthemactionmof
A) enzymesmasmkeysmthat mfit mdifferent mchemicals.
B) substratesmasmkeysmthat mfit mdifferent menzymes.
C) enzymesmasmlocksmthat mfit mothermenzymes.
D) substratesmasmlocksmthat mfit mdifferent menzyme
s.mAnswer:m B
PagemRef:mSectionm1-1
3) AccordingmtomCrick'smCentralmDogmamof mmolecularmBiology,mtheremcanmbemNO mtransferm
of minformationmfrom
A) DNA mtomRNA.
B) RNA mtomRNA.
C) RNA mtomprotein.
D) proteinmtomRNA
.mAnswer:m D
PagemRef:mSectionm1-1
4) What mismthemcorrect morderminmwhichmthesemkeymbreakthroughsminmbiochemistrymoccurred?
I. Watsonmand mCrickmDNAmstructure
II. CrickmCentralmdogma
III. Avery,mMacLeod mand mMcCartymDNA mworkmonmStreptococcus
IV. Widespread musemof mcomputers
A) I,mII,mIII,mIV
B) III,mI,mII,mIV
C) II,mI,mIII,mIV
D) IV,mIII,mI,mII
Answer:m B
PagemRef:mSectionm1-1
,5) Whichmelementsmaccount mformmoremthanm97%mof mthemweight mof mmost morganisms?
A) C,mH,mN,mMg,mO,mS
B) C,mH,mN,mO,mP,mS
C) C,mH,mN
D) Fe,mC,mH,mO,mP
E) Ca2+,mK+,mNa+,mMg2+,mCl-
Answer:m B
PagemRef:mSectionm1-2
6) Whichmlinkage(s)moccurmextensivelymin mnucleotides?
A) Amide.
B) Phosphoanhydride.
C) Phosphatemester.
D) Ether.
E) BothmBmand mCmabove
.mAnswer:m E
PagemRef:mSectionm1-2
7) Whichmfunctionalmgroupmismshown?
A) Primarymamine.
B) Acyl.
C) Amide.
D) Anhydride.
E) Nitrile.m
Answer:m
C
PagemRef:mSectionm1-2
8) Proteinsminmbiologicalmmembranesmmaymbe
A) porous.
B) attached mtomthemmembranemsurface.
C) spanmthemmembrane.
D) allmof mthemabove.
E) Bmand mCmonly
.mAnswer:m D
PagemRef:mSectionm1-3
,9) A mdipeptidemformsmwhenmamfunctionalm
groupmof monemaminomacid mreactsmwithmthemfunctionalm
groupmof manothermaminomacid mtomformmam bond.
A) carboxylate,mamino,mdouble
B) carboxylate,mamino,menzyme
C) amino,mcarboxylate,mphosphate
D) amino,mcarboxylate,mpeptide
mAnswer:m D
PagemRef:mSectionm1-3
10) Sugarsmsuchmasmglucosemaremmonomersmof mpolysaccharidesm that maremlinked mtogethermwhe
nmcovalent mbondsmformmbetweenmonem
groupmof monemsugarmtomthemsamemgroupmon manothermsugar.
A) ester
B) carboxyl
C) amino
D) hydroxyl
mAnswer:m
D
PagemRef:mSectionm1-3
11) Whichmstatement mabout mcellulosemismfalse?
A) It mismthemmost mabundant mpolysaccharideminmnature.
B) Itsmmonomersmaremjoined mbymglycosidicmbonds.
C) It mismpresent minmthemstemsmof mfloweringmplants.
D) Themhydroxylmgroupsmof mneighboringmcellulosemmoleculesminteract mtomformmstrong,minsolub
lemfibers.
E) It mismambranched mpolymermof mglucos
e.mAnswer:m E
PagemRef:mSectionm1-3
12) WhenmKeqmof mamreactionm=m1,mthen
A) themforward mreactionmismfastermthanmthemreversemreaction.
B) themreversemreactionmismfastermthanmthemforward mreaction.
C) themforward mand mreversemreactionmratemconstantsmaremequal.
D) moremproductsmaremformed mthanmreactants.
E) fewermproductsmaremformed mthanmreactants
.mAnswer:m C
PagemRef:mSectionm1-4
13) Most mof mthemenergymrequired mformlifemonmEarthmismsupplied mbym .
A) geothermalmenergy
B) themsun
C) cosmicmradiation
D) themconversionmof mADPmtomATP
E) mechanicalmenergy
mAnswer:m B
PagemRef:mSectionm1-4
, 14) Whichmstatement mismtruemabout mthemGibb'smfreemenergymof mamreaction?
A) It mismdependent monmthemconcentrationsmof mbothmproductsmand mreactants.
B) It mismdependent monlymonmthemconcentrationsmof mthemreactants.
C) It mismdependent monlymonmthemconcentrationsmof mthemproducts.
D) It mismnot mdependent monmthemconcentrationsmof meithermthemproductsmormreactan
ts.mAnswer:m A
PagemRef:mSectionm1-4
15) Whichmstatement mismtruemabout mamreactionmwithmanmequilibriummconstant,mKeq,mequalmtom1000?
A) Themforward mratemconstant mism1000mtimesmgreatermthanmthemreversemratemconstant.
B) Themforward mratemconstant mism3mtimesmgreatermthanmreversemratemconstant.
C) Themforward mratemconstant mism1000mtimesmsmallermthanmthemreversemratemconstant.
D) Themforward mratemconstant mism3mtimesmsmallermthanmthemreversemratemconstant.
E) Theremismnot menoughminformationmgivenmtomcomparemthemforward mand mreversemratemconstan
ts.mAnswer:m A
PagemRef:mSectionm1-4
16) If mamreactionmismat mequilibrium,mwhat mismthemfreemenergymchange?
A) It mismalwaysmpositive.
B) It mismalwaysmnegative.
C) It mcould mbemeithermpositivemormnegativemdependingmonmthemreaction.
D) It mequalsmzero
.mAnswer:m D
PagemRef:mSectionm1-4
17) Whichmstatement mismtrue?
A) If mDG mismnegative,mthenmthemratemof mthemreactionmwillmbemfast.
B) If mDG mismpositive,mthenmthemratemof mthemreactionmwillmbemfast.
C) If mDG mismnegative,mthenmthemratemof mthemreactionmwillmbemslow.
D) If mDG mismpositive,mthenmthemratemof mthemreactionmwillmbemslow.
E) Themreactionmratemismindependent mof mD
G.mAnswer:m E
PagemRef:mSectionm1-4
18) Themstudymof mthemenergymchangesmduringmmetabolicmreactionsmismcalled m .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicalmheat mdynamics
mAnswer:m D
PagemRef:mSectionm1-4
m m m
Horton: Principles Of Biochemistry 4th Edition Test Bank
m m m m m m m
1) Wohlermshowed mthat mamchemicalmfound monlyminmlivingmorganismsmcanmbemmademfromminorga
nicmsubstancesmwhenmhemsynthesized m .
A) Ammoniummcyanate
B) Aminomacids
C) Urea
D) Uricmaci
d mAnswer:m
C
PagemRef:mSectionm1-1
2) Themlock-and-keymtheorymdescribed mthemactionmof
A) enzymesmasmkeysmthat mfit mdifferent mchemicals.
B) substratesmasmkeysmthat mfit mdifferent menzymes.
C) enzymesmasmlocksmthat mfit mothermenzymes.
D) substratesmasmlocksmthat mfit mdifferent menzyme
s.mAnswer:m B
PagemRef:mSectionm1-1
3) AccordingmtomCrick'smCentralmDogmamof mmolecularmBiology,mtheremcanmbemNO mtransferm
of minformationmfrom
A) DNA mtomRNA.
B) RNA mtomRNA.
C) RNA mtomprotein.
D) proteinmtomRNA
.mAnswer:m D
PagemRef:mSectionm1-1
4) What mismthemcorrect morderminmwhichmthesemkeymbreakthroughsminmbiochemistrymoccurred?
I. Watsonmand mCrickmDNAmstructure
II. CrickmCentralmdogma
III. Avery,mMacLeod mand mMcCartymDNA mworkmonmStreptococcus
IV. Widespread musemof mcomputers
A) I,mII,mIII,mIV
B) III,mI,mII,mIV
C) II,mI,mIII,mIV
D) IV,mIII,mI,mII
Answer:m B
PagemRef:mSectionm1-1
,5) Whichmelementsmaccount mformmoremthanm97%mof mthemweight mof mmost morganisms?
A) C,mH,mN,mMg,mO,mS
B) C,mH,mN,mO,mP,mS
C) C,mH,mN
D) Fe,mC,mH,mO,mP
E) Ca2+,mK+,mNa+,mMg2+,mCl-
Answer:m B
PagemRef:mSectionm1-2
6) Whichmlinkage(s)moccurmextensivelymin mnucleotides?
A) Amide.
B) Phosphoanhydride.
C) Phosphatemester.
D) Ether.
E) BothmBmand mCmabove
.mAnswer:m E
PagemRef:mSectionm1-2
7) Whichmfunctionalmgroupmismshown?
A) Primarymamine.
B) Acyl.
C) Amide.
D) Anhydride.
E) Nitrile.m
Answer:m
C
PagemRef:mSectionm1-2
8) Proteinsminmbiologicalmmembranesmmaymbe
A) porous.
B) attached mtomthemmembranemsurface.
C) spanmthemmembrane.
D) allmof mthemabove.
E) Bmand mCmonly
.mAnswer:m D
PagemRef:mSectionm1-3
,9) A mdipeptidemformsmwhenmamfunctionalm
groupmof monemaminomacid mreactsmwithmthemfunctionalm
groupmof manothermaminomacid mtomformmam bond.
A) carboxylate,mamino,mdouble
B) carboxylate,mamino,menzyme
C) amino,mcarboxylate,mphosphate
D) amino,mcarboxylate,mpeptide
mAnswer:m D
PagemRef:mSectionm1-3
10) Sugarsmsuchmasmglucosemaremmonomersmof mpolysaccharidesm that maremlinked mtogethermwhe
nmcovalent mbondsmformmbetweenmonem
groupmof monemsugarmtomthemsamemgroupmon manothermsugar.
A) ester
B) carboxyl
C) amino
D) hydroxyl
mAnswer:m
D
PagemRef:mSectionm1-3
11) Whichmstatement mabout mcellulosemismfalse?
A) It mismthemmost mabundant mpolysaccharideminmnature.
B) Itsmmonomersmaremjoined mbymglycosidicmbonds.
C) It mismpresent minmthemstemsmof mfloweringmplants.
D) Themhydroxylmgroupsmof mneighboringmcellulosemmoleculesminteract mtomformmstrong,minsolub
lemfibers.
E) It mismambranched mpolymermof mglucos
e.mAnswer:m E
PagemRef:mSectionm1-3
12) WhenmKeqmof mamreactionm=m1,mthen
A) themforward mreactionmismfastermthanmthemreversemreaction.
B) themreversemreactionmismfastermthanmthemforward mreaction.
C) themforward mand mreversemreactionmratemconstantsmaremequal.
D) moremproductsmaremformed mthanmreactants.
E) fewermproductsmaremformed mthanmreactants
.mAnswer:m C
PagemRef:mSectionm1-4
13) Most mof mthemenergymrequired mformlifemonmEarthmismsupplied mbym .
A) geothermalmenergy
B) themsun
C) cosmicmradiation
D) themconversionmof mADPmtomATP
E) mechanicalmenergy
mAnswer:m B
PagemRef:mSectionm1-4
, 14) Whichmstatement mismtruemabout mthemGibb'smfreemenergymof mamreaction?
A) It mismdependent monmthemconcentrationsmof mbothmproductsmand mreactants.
B) It mismdependent monlymonmthemconcentrationsmof mthemreactants.
C) It mismdependent monlymonmthemconcentrationsmof mthemproducts.
D) It mismnot mdependent monmthemconcentrationsmof meithermthemproductsmormreactan
ts.mAnswer:m A
PagemRef:mSectionm1-4
15) Whichmstatement mismtruemabout mamreactionmwithmanmequilibriummconstant,mKeq,mequalmtom1000?
A) Themforward mratemconstant mism1000mtimesmgreatermthanmthemreversemratemconstant.
B) Themforward mratemconstant mism3mtimesmgreatermthanmreversemratemconstant.
C) Themforward mratemconstant mism1000mtimesmsmallermthanmthemreversemratemconstant.
D) Themforward mratemconstant mism3mtimesmsmallermthanmthemreversemratemconstant.
E) Theremismnot menoughminformationmgivenmtomcomparemthemforward mand mreversemratemconstan
ts.mAnswer:m A
PagemRef:mSectionm1-4
16) If mamreactionmismat mequilibrium,mwhat mismthemfreemenergymchange?
A) It mismalwaysmpositive.
B) It mismalwaysmnegative.
C) It mcould mbemeithermpositivemormnegativemdependingmonmthemreaction.
D) It mequalsmzero
.mAnswer:m D
PagemRef:mSectionm1-4
17) Whichmstatement mismtrue?
A) If mDG mismnegative,mthenmthemratemof mthemreactionmwillmbemfast.
B) If mDG mismpositive,mthenmthemratemof mthemreactionmwillmbemfast.
C) If mDG mismnegative,mthenmthemratemof mthemreactionmwillmbemslow.
D) If mDG mismpositive,mthenmthemratemof mthemreactionmwillmbemslow.
E) Themreactionmratemismindependent mof mD
G.mAnswer:m E
PagemRef:mSectionm1-4
18) Themstudymof mthemenergymchangesmduringmmetabolicmreactionsmismcalled m .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicalmheat mdynamics
mAnswer:m D
PagemRef:mSectionm1-4
