True/False
Indicate whether the
sentence or statement is true or false.
|
| |
1. |
Radioisotopes are used to date prehistoric life forms.
|
| |
2. |
Glucose forms a six-sided ring when dissolved in water.
|
| |
3. |
The
pH of vinegar is lower than the pH of pure water.
|
| |
4. |
Glycerol is hydrophobic.
|
| |
5. |
All
polypeptides contain an amino terminus and a carboxyl terminus.
|
| |
6. |
Fibrous proteins are rich in a helix.
|
| |
7. |
Chaperone proteins help assemble DNA molecules.
|
| |
8. |
The
amount of adenine equals the amount of cytosine in a molecule of DNA.
|
| |
9. |
Competitive inhibitors attach to the active site of an enzyme.
|
| |
10. |
In
feedback inhibition, an enzyme’s substrate attaches to an allosteric
site.
|
Multiple Choice
Identify
the letter of the choice that best completes the statement or answers
the question.
|
| |
11. |
Which
of the following properties of water helps move water to the tops of
trees?
a. |
high
specific heat of vaporization |
b. |
adhesion |
c. |
high
solubility |
d. |
high surface tension |
e. |
lower
density as a solid than as a liquid |
|
|
|
| |
12. |
Which
of the following is not a type of intermolecular force of attraction?
a. |
covalent
bond |
b. |
London
dispersion force |
c. |
dipole–dipole interaction |
d. |
hydrogen
bond |
e. |
hydrophobic
interaction |
|
|
|
| |
13. |
Which
of the following does a buffer comprise?
a. |
a strong acid only |
b. |
a
weak base only |
c. |
a
strong acid and a strong base |
d. |
a weak acid and a weak base |
e. |
an
alcohol and a base |
|
|
|
| |
14. |
Which
of the following polysaccharides contains more a1–6 glycosidic linkages?
a. |
amylose |
b. |
glycogen |
c. |
cellulose |
d. |
chitin |
e. |
amylopectin |
|
|
|
| |
15. |
How
many fatty acids are in a phospholipid molecule?
|
| |
16. |
Which
of the following bonds holds together a protein’s primary structure?
a. |
hydrogen
bonds |
b. |
ionic bonds |
c. |
London
forces |
d. |
covalent bonds |
e. |
dipole–dipole interactions |
|
|
|
| |
17. |
Which
of the following is not a component of DNA?
a. |
deoxyribose |
b. |
uracil |
c. |
phosphate |
d. |
adenine |
e. |
thymine |
|
|
|
| |
18. |
The
backbone of a DNA molecule is held together by which of following?
a. |
glycosidic
linkages |
b. |
peptide linkages |
c. |
phosphodiester
linkages |
d. |
ester linkages |
e. |
disulfide
bridges |
|
|
|
| |
19. |
Which
of the following is a statement of the second law of thermodynamics?
a. |
Energy
is conserved in the universe. |
b. |
Entropy is conserved in the universe. |
c. |
Living
organisms are exempt from this law. |
d. |
The entropy of the universe always increases. |
e. |
The energy of the universe always increases. |
|
|
|
| |
20. |
How
does an enzyme speed up a chemical reaction?
a. |
by providing additional heat energy |
b. |
by
reducing the potential energy of reactant molecules |
c. |
by lowering the activation energy of the
reaction |
d. |
by changing the position of equilibrium |
e. |
by becoming consumed in the reaction |
|
|
|