Principles of Biochemistry 4th Edition Testbank(Horton)

,Contents
Chapter 1 Introduction to Biochemistry g g g g 1
Chapter 2 Water 10
Chapter 3 Amino Acids and the Primary Structures of
g g g g g g g g g g g g 27
Proteins
g g


Chapter 4 Proteins: Three-Dimensional Structure and
g g g g g g 46
Function
g g


Chapter 5 Properties of Enzymes g g g g 65
Chapter 6 Mechanisms of Enzymes g g g g 85
Chapter 7 Coenzymes and Vitamins g g g g 104
Chapter 8 Carbohydrates 119
Chapter 9 Lipids and Membranes
g g g g 137
Chapter 10 Introduction to Metabolism g g g g 153
Chapter 11 Glycolysis 169
Chapter 12 Gluconeogenesis, The Pentose Phosphate Pathway, g g g g g g g g


and Glycogen Metabolism
g g g g 185
Chapter 13 The Citric Acid Cycle
g g g g g g 199
Chapter 14 Electron Transport and Oxidative Phosphorylation
g g g g g g g g 213
Chapter 15 Photosynthesis 227
Chapter 16 Lipid Metabolism
g g 241
Chapter 17 Amino Acid Metabolism
g g g g 256
Chapter 18 Nucleotide Metabolism g g 269
Chapter 19 Nucleic Acids g g 284
Chapter 20 DNA Replication, Repair, and Recombination
g g g g g g g g 300
Chapter 21 Transcription and RNA Processing g g g g g g 315
Chapter 22 Protein Synthesis
g g 330
Chapter 23 Recombinant DNA Technology g g g g 348

,Chapter 1 Introduction to Biochemistry
g g g g g g g g




1) Which elements g g g g account for more than 97% of g g g g the g g g g weight
of g g g g most g g g g organisms?
A) C, g g g g H, g g N, g g Mg, g g O, g g g g S
B) C, g g g g H, g g N, g g O, g g g g P, g g S
C) C, g g g g H, g g N
D) Fe, g g C, g g g g H, g g O, g g g g P
E) Ca2+, g g K+, g g Na+, Mg2+, g g Cl-

Answer: B
Page g g Ref: g g Section g g 2


2) Proteins g g g g in g g g g biological membranes may g g g g be
A) porous.
B) attached to g g g g the membrane surface.
C) span the membrane.
D) All of g g the g g g g above
E) B g g g g and g g g g C gg gg only

Answer: D
Page g g Ref: g g Section g g 3


3) Which statement g g g g about cellulose is g g g g false?
A) It is g g g g the g g g g most g g g g abundant polysaccharide in g g g g nature.
B) Its g g g g monomers are joined by g g gg glycosidic bonds.
C) It is g g g g present in g g gg the g g g g stems g g g g of g g flowering g g g g plants.
D) The hydroxyl groups of g g neighboring cellulose molecules interact to
ggform strong, gginsoluble fibers. dddd




E) It is g g g g a branched g g g g polymer of g g glucose.

Answer: E
Page g g Ref: g g Section g g 3




1

, 4) When g g Keq g g of g g a reaction g g gg = g g 1, g g g g then

A) g g the forward reaction g g g g is
than the g g g g faster reaction.
reverse
B) g g the reverse reaction g g g g is g g g g faster than the reaction.
forward
C) g g the forward and reverse reaction g g g g rate g g are equal.
g g constants



D) more products g g g g are formed g g g g than reactants.
E) fewer products g g g g are formed than reactants.

Answer: C
Page g g Ref: g g Section g g 4


5) Which statement g g is g g true g g about a
reaction g g with g g an g g equilibrium g g constant, Keq,
equal to
gg g g 1000?
A) The forward g g rate g g constant is g g 1000 g g times
g greater
g than the g g reverse rate
ggconstant.



B) The forward g g g g rate g g g g constant is g g g g 3 times g g g g greater than g g


g g reverse rate g g g g constant.
C) The forward rate g g constant is g g 1000 g g times g g smaller g g than the
reverse rate ggconstant.
D) The forward g g rate g g constant is g g 3 times g g smaller
g g than the g g reverse rate ggconstant.
E) There g g is g g not enough information given g g to
g g compare g g the forward and ggreverse rate
g g constants.




Answer: A
Page g g Ref: g g Section g g 4


6) The study of g g g g the energy changes during metabolic g g


g g reactions is g g g g called .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biological heat dynamics

Answer: D
Page g g Ref: g g Section g g 4


7) A spontaneous chemical reaction g g g g always has a change.
A) positive Gibbʹs g g g g free energy

2