1
, Biochemistry- jComplete jExam jTest jBank j- jExam jQuestions
j&jAnswers
Chapter j1: jIntroduction jto jBiochemistry
1) Which j elements jaccount j for j more j than j 97% j of jthe j weight j of jmost jorganisms?
A) C, jH, jN, jMg, jO, jS
B) C, j H, jN, jO, j P, jS
C) C, jH, jN
D) Fe, jC, jH, jO, j P
E) Ca2+, j K+, j Na+, j Mg2+, j Cl-
Answer: j B
Page j Ref: j Section j 2
2) Proteins jin jbiological j membranes j may j be
A) porous.
B) attached j to jthe j membrane j surface.
C) span j the jmembrane.
D) All jof jthe jabove
E) B jand jC jonly
Answer: j D
Page j Ref: j Section j 3
3) Which j statement j about j cellulose j is jfalse?
A) It j is jthe jmost jabundant j polysaccharide j in jnature.
B) Its jmonomers j are j joined j by jglycosidic j bonds.
C) It j is jpresent j in jthe jstems jof jflowering jplants.
D) The j hydroxyl j groups j of jneighboring j cellulose j molecules j interact j to jform j strong,
j insolublejfibers.
E) It j is ja j branched jpolymer j of jglucose.
Answer: j E
Page j Ref: j Section j 3
2
,4) When j Keq j of j a j reaction j = j1, j then
A) the j forward j reaction jis jfaster j than j the j reverse j reaction.
B) the j reverse j reaction jis jfaster j than j the j forward j reaction.
C) the j forward j and j reverse j reaction jrate j constants j are j equal.
D) more j products jare j formed jthan j reactants.
E) fewer j products jare j formed j than j reactants.
Answer: j C
Page j Ref: j Section j 4
5) Which j statement j is jtrue jabout j a j reaction jwith jan j equilibrium j constant, j Keq, jequal j to j1000?
A) The j forward jrate j constant j is j1000 j times jgreater j than j the jreverse j rate j constant.
B) The j forward jrate j constant j is j3 j times jgreater j than j reverse j rate jconstant.
C) The j forward jrate j constant j is j1000 j times jsmaller jthan j the j reverse j rate j constant.
D) The j forward jrate j constant j is j3 j times jsmaller jthan j the jreverse j rate jconstant.
E) There jis jnot j enough j information j given j to jcompare j the j forward j and jreverse j rate
j constants.
Answer: j A
Page j Ref: j Section j 4
6) The j study j of jthe j energy j changes j during j metabolic j reactions j is jcalled .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biological j heat j dynamics
Answer: j D
Page j Ref: j Section j 4
7) A j spontaneous j chemical j reaction j always j has j a change.
A) positive j Gibbʹs jfree j energy
B) negative j Gibbʹs j free j energy
C) positive j enthalpy
D) negative j enthalpy
E) positive j entropy
Answer: j B
Page j Ref: j Section j 4
3
, 8) Prokaryotes jare j valuable jtools j for j biochemists jbecause
A) E. jcoli jis jwell-studied j and jtypical jof jprokaryotes.
B) they jcontain j as jmany j genes j as jeukaryotic j cells.
C) many j of jtheir j chromosomes j are j sequenced.
D) they jare j not j very j diverse jorganisms.
E) All jof jthe jabove
Answer: j C
Page j Ref: j Section j 6
9) Which j cellular j component j carries j out j oxidation j reactions, j some j of jwhich j produce
j hydrogenjperoxide?
A) peroxisomes
B) mitochondria
C) chloroplasts
D) lysosomes
E) vacuoles
Answer: j A
Page j Ref: j Section j 8
10) Why j is jit j important j that j the jenzymes j in jlysosomes j are j more j active jat j acidic j pH j than j at
j neutraljpH?
A) Since jlysosomes jare jprimarily jfound jin jthe jstomach jacid jof jmammals, jtheir
jpHjdependence j allows j for j maximum jefficiency j for j the j digestion j of
jfoodstuffs.
B) It j prevents jtheir jdiffusion jout jof jthe jlysosomes.
C) It j maximizes j the j interaction j with jtheir j substrates j which j are j always j bases.
D) It j prevents j them j from j accidentally j degrading j the j macromolecules j in jthe j cytosol.
E) It j allows j for j regulation j of jtheir j uptake j by jthe jmitochondria.
Answer: j D
Page j Ref: j Section j 8
11) Molecules j from j living j cells jcannot j be jsynthesized j outside j of jliving
j cells.jAnswer: j FALSE
Page j Ref: j Section j 1
12) Fermentation j in jthe j absence j of jcells j demonstrated jthat j metabolic j processes j were
jchemical j injnature.
Answer: j TRUE
Page j Ref: j Section j 1
4
, Biochemistry- jComplete jExam jTest jBank j- jExam jQuestions
j&jAnswers
Chapter j1: jIntroduction jto jBiochemistry
1) Which j elements jaccount j for j more j than j 97% j of jthe j weight j of jmost jorganisms?
A) C, jH, jN, jMg, jO, jS
B) C, j H, jN, jO, j P, jS
C) C, jH, jN
D) Fe, jC, jH, jO, j P
E) Ca2+, j K+, j Na+, j Mg2+, j Cl-
Answer: j B
Page j Ref: j Section j 2
2) Proteins jin jbiological j membranes j may j be
A) porous.
B) attached j to jthe j membrane j surface.
C) span j the jmembrane.
D) All jof jthe jabove
E) B jand jC jonly
Answer: j D
Page j Ref: j Section j 3
3) Which j statement j about j cellulose j is jfalse?
A) It j is jthe jmost jabundant j polysaccharide j in jnature.
B) Its jmonomers j are j joined j by jglycosidic j bonds.
C) It j is jpresent j in jthe jstems jof jflowering jplants.
D) The j hydroxyl j groups j of jneighboring j cellulose j molecules j interact j to jform j strong,
j insolublejfibers.
E) It j is ja j branched jpolymer j of jglucose.
Answer: j E
Page j Ref: j Section j 3
2
,4) When j Keq j of j a j reaction j = j1, j then
A) the j forward j reaction jis jfaster j than j the j reverse j reaction.
B) the j reverse j reaction jis jfaster j than j the j forward j reaction.
C) the j forward j and j reverse j reaction jrate j constants j are j equal.
D) more j products jare j formed jthan j reactants.
E) fewer j products jare j formed j than j reactants.
Answer: j C
Page j Ref: j Section j 4
5) Which j statement j is jtrue jabout j a j reaction jwith jan j equilibrium j constant, j Keq, jequal j to j1000?
A) The j forward jrate j constant j is j1000 j times jgreater j than j the jreverse j rate j constant.
B) The j forward jrate j constant j is j3 j times jgreater j than j reverse j rate jconstant.
C) The j forward jrate j constant j is j1000 j times jsmaller jthan j the j reverse j rate j constant.
D) The j forward jrate j constant j is j3 j times jsmaller jthan j the jreverse j rate jconstant.
E) There jis jnot j enough j information j given j to jcompare j the j forward j and jreverse j rate
j constants.
Answer: j A
Page j Ref: j Section j 4
6) The j study j of jthe j energy j changes j during j metabolic j reactions j is jcalled .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biological j heat j dynamics
Answer: j D
Page j Ref: j Section j 4
7) A j spontaneous j chemical j reaction j always j has j a change.
A) positive j Gibbʹs jfree j energy
B) negative j Gibbʹs j free j energy
C) positive j enthalpy
D) negative j enthalpy
E) positive j entropy
Answer: j B
Page j Ref: j Section j 4
3
, 8) Prokaryotes jare j valuable jtools j for j biochemists jbecause
A) E. jcoli jis jwell-studied j and jtypical jof jprokaryotes.
B) they jcontain j as jmany j genes j as jeukaryotic j cells.
C) many j of jtheir j chromosomes j are j sequenced.
D) they jare j not j very j diverse jorganisms.
E) All jof jthe jabove
Answer: j C
Page j Ref: j Section j 6
9) Which j cellular j component j carries j out j oxidation j reactions, j some j of jwhich j produce
j hydrogenjperoxide?
A) peroxisomes
B) mitochondria
C) chloroplasts
D) lysosomes
E) vacuoles
Answer: j A
Page j Ref: j Section j 8
10) Why j is jit j important j that j the jenzymes j in jlysosomes j are j more j active jat j acidic j pH j than j at
j neutraljpH?
A) Since jlysosomes jare jprimarily jfound jin jthe jstomach jacid jof jmammals, jtheir
jpHjdependence j allows j for j maximum jefficiency j for j the j digestion j of
jfoodstuffs.
B) It j prevents jtheir jdiffusion jout jof jthe jlysosomes.
C) It j maximizes j the j interaction j with jtheir j substrates j which j are j always j bases.
D) It j prevents j them j from j accidentally j degrading j the j macromolecules j in jthe j cytosol.
E) It j allows j for j regulation j of jtheir j uptake j by jthe jmitochondria.
Answer: j D
Page j Ref: j Section j 8
11) Molecules j from j living j cells jcannot j be jsynthesized j outside j of jliving
j cells.jAnswer: j FALSE
Page j Ref: j Section j 1
12) Fermentation j in jthe j absence j of jcells j demonstrated jthat j metabolic j processes j were
jchemical j injnature.
Answer: j TRUE
Page j Ref: j Section j 1
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