,Chapter 1nm Introduction to Biochemistry of life nm nm nm nm
1) Whichn m elementsn m accountn m forn m moren m thann m 97%n m ofn m then m weight n m ofn m most n m organisms?
A) C,n m H, n m N, n m Mg, n m O, n m S
B) C,n m H, n m N,n m O, n m P,n m S
C) C,n m H,n m N
D) Fe,n m C,n m H, n m O, n m P
E) Ca2+,n m K+,n m Na+,n m Mg2+,n m Cl-
Answer:n m n m B
Pagen m Ref:n m Sectionn m 2
2) Proteinsn m inn m biological n m membranesn m n m mayn m be
A) porous.
B) attachedn m ton m then m membranen m surface.
C) spann m then m membrane.
D) Alln m ofn m then m above
E) Bn m andn m C n m only
Answer:n m n m D
Pagen m Ref:n m Sectionn m 3
3) Whichn m statementn m aboutn m cellulosen m isn m false?
A) Itn m isn m then m mostn m abundant n m polysacchariden m inn m nature.
B) Itsn m monomersn m aren m joinedn m byn m glycosidic n m bonds.
C) Itn m isn m presentn m inn m then m stemsn m ofn m flowering n m plants.
D) Then m hydroxyln m groupsn m of n m neighboringn m cellulosen m molecules n m interactn m ton
m formn m strong,nminsolublenmfibers.
E) Itn m isn m an m branchedn m polymern m of n m glucose.
Answer:n m n m E
Pagen m Ref:n m Sectionn m 3
1
,4) Whenn m K eqn m ofn m an m reactionn m =n m 1,n m then
A) then m forwardn m reactionn m isn m fastern m thann m then m reversen m reaction.
B) then m reversen m reactionn m isn m fastern m thann m then m forwardn m reaction.
C) then m forwardn m andn m reversen m reactionn m raten m constantsn m aren m equal.
D) moren m productsn m aren m formedn m thann m reactants.
E) fewern m productsn m aren m formedn m thann m reactants.
Answer:n m n m C
Pagen m Ref:n m Sectionn m 4
5) Whichn m statementn m isn m truen m aboutn m an m reactionn m withn m ann m equilibriumn m constant,n m Keq,n m equal
n m ton m 1000?
A) Then m forwardn m raten m constant n m isn m 1000n m timesn m greatern m thann m then m reversen m raten m consta
nt.
B) Then m forwardn m raten m constant n m isn m 3n m timesn m greatern m thann m reversen m raten m constant.
C) Then m forwardn m raten m constantn m isn m 1000n m timesn m smallern m thann m then m reversen m raten m consta
nt.
D) Then m forwardn m raten m constant n m isn m 3n m timesn m smallern m thann m then m reversen m raten m constant.
E) Theren m isn m not n m enoughn m informationn m givenn m ton m comparen m then m forwardn m andn m reversen
m raten m constants.
Answer:n m n m A
Pagen m Ref:n m Sectionn m 4
6) Then m studyn m ofn m then m energyn m changesn m during n m metabolicn m reactionsn m isn m callednm.
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicaln m heat n m dynamics
Answer:n m n m D
Pagen m Ref:n m Sectionn m 4
7) An m spontaneousn m chemicaln m reactionn m alwaysn m n m hasn m a change.
A) positiven m Gibbʹsn m freen m energy
B) negativen m Gibbʹsn m freen m energy
C) positiven m enthalpy
D) negativen m enthalpy
E) positiven m entropy
Answer:n m n m B
Pagen m Ref:n m Sectionn m 4
2
, 8) Prokaryotesn m aren m valuablen m toolsn m forn m biochemistsn m because
A) E.n m colin m isn m well-studiedn m andn m typical n m of n m prokaryotes.
B) theyn m containn m asn m manyn m genesn m asn m eukaryoticn m cells.
C) manyn m of n m theirn m chromosomesn m aren m sequenced.
D) theyn m aren m not n m veryn m diversen m organisms.
E) Alln m ofn m then m above
Answer:n m n m C
Pagen m Ref:n m Sectionn m 6
9) Whichn m cellularn m component n m carriesn m outn m oxidationn m reactions,n m somen m ofn m w
hichn m producenmhydrogennmperoxide?
A) peroxisomes
B) mitochondria
C) chloroplasts
D) lysosomes
E) vacuoles
Answer:n m n m A
Pagen m Ref:n m Sectionn m 8
10) Whyn m isn m itn m importantn m that n m then m enzymesn m inn m lysosomesn m aren m moren m acti
ven m at n m acidicn m pHnmthann m at n m neutral nmpH?
A) Sincen m lysosomesn m aren m primarilyn m foundn m inn m then m stomachn m acidn
m ofn m mammals, nmtheir n m pH nmdependencen m allows n m for n m maximum n m effi
ciencyn m forn m then m digestionnmofn m foodstuffs.
B) Itn m preventsn m theirn m diffusionn m outn m of n m then m lysosomes.
C) Itn m maximizesn m then m interactionn m withn m theirn m substratesn m whichn m aren m alwaysn m bases.
D) Itn m preventsn m themn m fromn m accidentallyn m degrading n m then m macromoleculesn m inn m then m cytoso
l.
E) Itn m allowsn m forn m regulationn m ofn m theirn m uptaken m byn m then m mitochondria.
Answer:n m n m D
Pagen m Ref:n m Sectionn m 8
11) Moleculesn m fromn m living n m cellsn m cannot n m ben m synthesizedn m
outsiden m ofnmliving n m cells.nmAnswer:n m FALSE
Pagen m Ref:n m Sectionn m 1
12) Fermentationn m inn m then m absencen m of n m cellsn m demonstratedn m thatn m metabolicn m p
rocessesn m werenmchemical n m innmnature.
Answer:n m n m TRUE
Pagen m Ref:n m Sectionn m 1
3
1) Whichn m elementsn m accountn m forn m moren m thann m 97%n m ofn m then m weight n m ofn m most n m organisms?
A) C,n m H, n m N, n m Mg, n m O, n m S
B) C,n m H, n m N,n m O, n m P,n m S
C) C,n m H,n m N
D) Fe,n m C,n m H, n m O, n m P
E) Ca2+,n m K+,n m Na+,n m Mg2+,n m Cl-
Answer:n m n m B
Pagen m Ref:n m Sectionn m 2
2) Proteinsn m inn m biological n m membranesn m n m mayn m be
A) porous.
B) attachedn m ton m then m membranen m surface.
C) spann m then m membrane.
D) Alln m ofn m then m above
E) Bn m andn m C n m only
Answer:n m n m D
Pagen m Ref:n m Sectionn m 3
3) Whichn m statementn m aboutn m cellulosen m isn m false?
A) Itn m isn m then m mostn m abundant n m polysacchariden m inn m nature.
B) Itsn m monomersn m aren m joinedn m byn m glycosidic n m bonds.
C) Itn m isn m presentn m inn m then m stemsn m ofn m flowering n m plants.
D) Then m hydroxyln m groupsn m of n m neighboringn m cellulosen m molecules n m interactn m ton
m formn m strong,nminsolublenmfibers.
E) Itn m isn m an m branchedn m polymern m of n m glucose.
Answer:n m n m E
Pagen m Ref:n m Sectionn m 3
1
,4) Whenn m K eqn m ofn m an m reactionn m =n m 1,n m then
A) then m forwardn m reactionn m isn m fastern m thann m then m reversen m reaction.
B) then m reversen m reactionn m isn m fastern m thann m then m forwardn m reaction.
C) then m forwardn m andn m reversen m reactionn m raten m constantsn m aren m equal.
D) moren m productsn m aren m formedn m thann m reactants.
E) fewern m productsn m aren m formedn m thann m reactants.
Answer:n m n m C
Pagen m Ref:n m Sectionn m 4
5) Whichn m statementn m isn m truen m aboutn m an m reactionn m withn m ann m equilibriumn m constant,n m Keq,n m equal
n m ton m 1000?
A) Then m forwardn m raten m constant n m isn m 1000n m timesn m greatern m thann m then m reversen m raten m consta
nt.
B) Then m forwardn m raten m constant n m isn m 3n m timesn m greatern m thann m reversen m raten m constant.
C) Then m forwardn m raten m constantn m isn m 1000n m timesn m smallern m thann m then m reversen m raten m consta
nt.
D) Then m forwardn m raten m constant n m isn m 3n m timesn m smallern m thann m then m reversen m raten m constant.
E) Theren m isn m not n m enoughn m informationn m givenn m ton m comparen m then m forwardn m andn m reversen
m raten m constants.
Answer:n m n m A
Pagen m Ref:n m Sectionn m 4
6) Then m studyn m ofn m then m energyn m changesn m during n m metabolicn m reactionsn m isn m callednm.
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biologicaln m heat n m dynamics
Answer:n m n m D
Pagen m Ref:n m Sectionn m 4
7) An m spontaneousn m chemicaln m reactionn m alwaysn m n m hasn m a change.
A) positiven m Gibbʹsn m freen m energy
B) negativen m Gibbʹsn m freen m energy
C) positiven m enthalpy
D) negativen m enthalpy
E) positiven m entropy
Answer:n m n m B
Pagen m Ref:n m Sectionn m 4
2
, 8) Prokaryotesn m aren m valuablen m toolsn m forn m biochemistsn m because
A) E.n m colin m isn m well-studiedn m andn m typical n m of n m prokaryotes.
B) theyn m containn m asn m manyn m genesn m asn m eukaryoticn m cells.
C) manyn m of n m theirn m chromosomesn m aren m sequenced.
D) theyn m aren m not n m veryn m diversen m organisms.
E) Alln m ofn m then m above
Answer:n m n m C
Pagen m Ref:n m Sectionn m 6
9) Whichn m cellularn m component n m carriesn m outn m oxidationn m reactions,n m somen m ofn m w
hichn m producenmhydrogennmperoxide?
A) peroxisomes
B) mitochondria
C) chloroplasts
D) lysosomes
E) vacuoles
Answer:n m n m A
Pagen m Ref:n m Sectionn m 8
10) Whyn m isn m itn m importantn m that n m then m enzymesn m inn m lysosomesn m aren m moren m acti
ven m at n m acidicn m pHnmthann m at n m neutral nmpH?
A) Sincen m lysosomesn m aren m primarilyn m foundn m inn m then m stomachn m acidn
m ofn m mammals, nmtheir n m pH nmdependencen m allows n m for n m maximum n m effi
ciencyn m forn m then m digestionnmofn m foodstuffs.
B) Itn m preventsn m theirn m diffusionn m outn m of n m then m lysosomes.
C) Itn m maximizesn m then m interactionn m withn m theirn m substratesn m whichn m aren m alwaysn m bases.
D) Itn m preventsn m themn m fromn m accidentallyn m degrading n m then m macromoleculesn m inn m then m cytoso
l.
E) Itn m allowsn m forn m regulationn m ofn m theirn m uptaken m byn m then m mitochondria.
Answer:n m n m D
Pagen m Ref:n m Sectionn m 8
11) Moleculesn m fromn m living n m cellsn m cannot n m ben m synthesizedn m
outsiden m ofnmliving n m cells.nmAnswer:n m FALSE
Pagen m Ref:n m Sectionn m 1
12) Fermentationn m inn m then m absencen m of n m cellsn m demonstratedn m thatn m metabolicn m p
rocessesn m werenmchemical n m innmnature.
Answer:n m n m TRUE
Pagen m Ref:n m Sectionn m 1
3
