Principles of Biochemistry 4th Edition Testbank(Horton)

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

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

Chapter 5 Properties s s of s s Enzymes 65
Chapter 6 Mechanisms s s of s s Enzymes 85
Chapter 7 Coenzymes s s and s s Vitamins 104
Chapter 8 Carbohydrates 119
Chapter 9 Lipids s s and s s Membranes 137
Chapter 10 Introduction s s to s s Metabolism 153
Chapter 11 Glycolysis 169
Chapter 12 Gluconeogenesis, s s The s s Pentose s s Phosphate s s Pathway,
and s s Glycogen s s Metabolism 185
Chapter 13 The s s Citric s s Acid s s Cycle 199
Chapter 14 Electron s s Transport s s and s s Oxidative s s Phosphorylation 213
Chapter 15 Photosynthesis 227
Chapter 16 Lipid s s Metabolism 241
Chapter 17 Amino s s Acid s s Metabolism 256
Chapter 18 Nucleotide s s Metabolism 269
Chapter 19 Nucleic s s Acids 284
Chapter 20 DNA s s Replication, s s Repair, s s and s s Recombination 300
Chapter 21 Transcription s s and s s RNA s s Processing 315
Chapter 22 Protein s s Synthesis 330
Chapter 23 Recombinant s s DNA s s Technology 348

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




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

Answer: B
Page s s Ref: s s Section s s 2


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

Answer: D
Page s s Ref: s s Section s s 3


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




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

Answer: E
Page s s Ref: s s Section s s 3




1

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

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


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

Answer: C
Page s s Ref: s s Section s s 4


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


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

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



Answer: A
Page s s Ref: s s Section s s 4


6) The study of s s ss 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
Page s s Ref: s s Section 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

2