Lehninger Biochemistry 5th Edition - Test Bank
Chapter
2 Water
Multiple
Choice Questions
1. Weak
interactions in aqueous systems
Page: 43–45 Difficulty: 2 Ans:
D
Which
of these statements about hydrogen bonds is not
true?
A)
Hydrogen bonds
account for the anomalously high boiling point of water.
B)
In liquid water,
the average water molecule forms hydrogen bonds with three to four other water
molecules.
C)
Individual
hydrogen bonds are much weaker than covalent bonds.
D)
Individual
hydrogen bonds in liquid water exist for many seconds and sometimes for
minutes.
E)
The strength of
a hydrogen bond depends on the linearity of the three atoms involved in the
bond.
2. Weak
interactions in aqueous systems
Page: 48 Difficulty:
2 Ans: A
A
true statement about hydrophobic interactions is that they:
A)
are the driving
force in the formation of micelles of amphipathic compounds in water.
B)
do not
contribute to the structure of water-soluble proteins.
C)
have bonding
energies of approximately 20–40 Kjoule per mole.
D)
involve the
ability of water to denature proteins.
E)
primarily
involve the effect of polar solutes on the entropy of aqueous systems.
3. Weak
interactions in aqueous systems
Page: 48–49 Difficulty: 2 Ans:
E
Hydrophobic
interactions make important energetic contributions to:
A)
binding of a
hormone to its receptor protein.
B)
enzyme-substrate
interactions.
C)
membrane
structure.
D)
three-dimensional
folding of a polypeptide chain.
E)
all of the above
are true.
4. Weak
interactions in aqueous systems
Page: 51 Difficulty:
2 Ans: A
Dissolved
solutes alter some physical (colligative) properties of the solvent water
because they change the:
A)
concentration of
the water.
B)
hydrogen bonding
of the water.
C)
ionic bonding of
the water.
D)
pH of the water.
E)
temperature of
the water.
5. Weak
interactions in aqueous systems
Page: 51 Difficulty:
2 Ans: E
Osmosis
is movement of a:
A)
charged solute
molecule (ion) across a membrane.
B)
gas molecule
across a membrane.
C)
nonpolar solute
molecule across a membrane.
D)
polar solute
molecule across a membrane.
E)
water molecule
across a membrane.
6. Ionization of
water, weak acids, and weak bases
Page: 54 Difficulty:
2 Ans: E
A
hydronium ion:
A)
has the
structure H3O+.
B)
is a hydrated
hydrogen ion.
C)
is a hydrated
proton.
D)
is the usual
form of one of the dissociation products of water in solution.
E)
all of the above
are true.
7. Ionization of
water, weak acids, and weak bases
Page: 56 Difficulty:
2 Ans: A
The pH of a
solution of 1 M HCl is:
A)
0
B)
0.1
C)
1
D)
10
E)
–1
8. Ionization of
water, weak acids, and weak bases
Page: 56 Difficulty:
2 Ans: D
The pH of a
solution of 0.1 M NaOH is:
A)
0.1
B)
1.0
C)
12.8
D)
13
E)
14
9. Ionization of
water, weak acids, and weak bases
Page: 56 Difficulty:
2 Ans: D
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