Principles of Biochemistry 4th Edition Testbank(Horton)

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



Chapter 4 Proteins: Three-Dimensional Structure and Function
s s s s s s s s 46
Chapter 5 Properties of Enzymes s s s s 65
Chapter 6 Mechanisms of Enzymes s s s s 85
Chapter 7 Coenzymes and Vitamins s s s s 104
Chapter 8 Carbohydrates 119
Chapter 9 Lipids and Membranes s s s s 137
Chapter 10 Introduction to Metabolism s s s s 153
Chapter 11 Glycolysis 169
Chapter 12 Gluconeogenesis, The Pentose Phosphate Pathway, s s s s s s s s



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

,Chapter 1 Introduction to Biochemistry
s s s s s s s s




1) Which elements s s s s account for more than 97% of s s s s the s s s s weight of s s s s most s s



organisms?
s s




A) C, s s s s H, s s N, s s Mg, s s O, s s s s S
B) C, s s s s H, s s N, s s O, s s s s P, s s S
C) C, s s s s H, s s N
D) Fe, s s C, s s s s H, s s O, s s s s P
E) Ca2+, s s K+, s s Na+, Mg2+, s s Cl-

Answer: B
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s s s s s s 2


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

Answer: D
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s s s s s s 3


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




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

Answer: E
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s s s s s s 3




1

, 4) When s s Keq s s of s s a reaction s s s s = s s 1, s s s s then

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




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

Answer: C
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s s s s s s 4


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




B) The forward rate s s s s s s s s constant is s s s s 3 times s s s s greater than s s s s reverse
rate constant. s s s s




C) The forward rate constant is s s s s 1000 s s times s s smaller s s than the
reverse rate constant. ss




D) The forward s s rate s s constant is 3 times s s s s smaller s s than the
s s reverse rate constant. ss




E) There is not s s s s enough information given s s to
compare s the s s s forward and reverse ss rate
constants.
s s




Answer: A
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s s s s s s 4


6) The study of s s s s the energy changes during metabolic s s s s reactions is s s s s called .
A) bioinformatics
B) metabodynamics
C) thermometrics
D) bioenergetics
E) biological heat dynamics

Answer: D
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s s s s s s 4


7) A spontaneous chemical reaction s s s s always has a change.
A) positive Gibbʹs s s s s free energy
B) negative Gibbʹs free energy
C) positive enthalpy
2