,DOWNLOAD THE Test Bank for Biochemistry Short Course 4th Edition
Tymoczko
Name: Class: Date:
Chapter 2
1. Molecules that are readily soluble in water are considered:
a. nonpolar.
b. polar.
c. zwitterionic.
d. volatile.
e. dielectric.
ANSWER: b
2. The interaction that is described by Coulomb's law is called:
a. hydrophobic.
b. weak.
c. electrostatic.
d. hydrogen.
e. physical.
ANSWER: c
3. What would be the solubility of a salt in a solvent with a low dielectric constant?
a. excellent
b. good
c. suitable
d. poor
e. exclusive
ANSWER: d
4. Hydrophobic molecules are driven together by:
a. entropy.
b. enthalpy.
c. van der Waals interactions.
d. affinity.
e. hydrogen bonds.
ANSWER: a
5. The protein that interacts with both water and the hydrophobic regions of the membrane is considered:
a. polar.
b. nonpolar.
c. amphibious.
d. anabolic.
e. amphipathic.
ANSWER: e
6. Protonation of a base yields its:
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,DOWNLOAD THE Test Bank for Biochemistry Short Course 4th Edition
Tymoczko
Name: Class: Date:
Chapter 2
a. conjugate molecule.
b. conjugate base.
c. conjugate acid.
d. ionized derivative.
e. ionized base.
ANSWER: c
7. An organic acid ionizes to form a conjugate base and:
a. hydrogen.
b. water.
c. a hydroxyl ion.
d. a proton.
e. hydrogen peroxide.
ANSWER: d
8. Gastroesophageal reflux disease is a common example of a pathological change in:
a. pKa of acetic acid.
b. hydrogen bonds in a key digestive enzyme.
c. protein structure.
d. water content in cells.
e. pH level.
ANSWER: e
9. What is the pH of human blood?
a. 5.5
b. 7.0
c. 9.4
d. 6.4
e. 7.4
ANSWER: e
10. Choose the functional group that CANNOT form a hydrogen bond with water.
a. carbonyl group
b. amino group
c. aromatic ring
d. alcohol group
e. sulfhydryl group
ANSWER: c
11. Which combination can associate to form a hydrogen bond?
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, DOWNLOAD THE Test Bank for Biochemistry Short Course 4th Edition
Tymoczko
Name: Class: Date:
Chapter 2
a. N–H and O
b. N–H and S
c. O–H and P
d. C=O and S
e. C=O and P
ANSWER: a
12. What is the typical length of noncovalent bonds?
a. 0.4 angstroms
b. 4 angstroms
c. 40 angstroms
d. 4 nm
e. 0.04 nm
ANSWER: b
13. In a typical cell, the water content is about:
a. 60%.
b. 70%.
c. 80%.
d. 90%.
e. 99%.
ANSWER: b
14. Oxygen is an electronegative atom. That means that in a molecule of water the:
a. electrons of covalent bonds spend more time near the oxygen atom than near the hydrogen atoms.
b. electrons of covalent bonds spend more time near the hydrogen atoms than near the oxygen atom.
c. electrons of bonds are located closely to the hydrogen atoms.
d. electrons of bonds are located closely to the oxygen atom.
e. bonds joining the hydrogen atoms to the oxygen atom are noncovalent.
ANSWER: a
15. What does it mean that liquid water has a partly ordered structure?
a. There are van der Waals interactions between water molecules.
b. Hydrogen-bonded clusters of molecules are continually being formed and broken apart in liquid
water.
c. In the physiological range of temperatures liquid water can undergo phase transition to gas that is
completely unordered and to ice that is completely ordered.
d. There is Brownian motion of water molecules.
e. Water molecules can form hydrogen bonds with polar molecules but not with nonpolar molecules.
ANSWER: b
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