Practice Test 2
Section I (Multiple-Choice Questions)
Time: 80 minutes
100 questions
Directions: Each of the following questions or statements is
... [Show More] followed by five possible answers or sentence completions.
Choose the one best answer or sentence completion.
1. In which of the following are the nuclear activities
most opposite?
A. prophase and metaphase
B. prophase and anaphase
C. prophase and telophase
D. metaphase and anaphase
E. metaphase and telophase
2. A severe storm forms a new river that divides a
population of mice. After 500 years, a drought
causes the river to dry up, allowing the two
populations of mice to mix. Mating between mice
from the two populations does not yield any
offspring. This is an example of
A. hybridization
B. adaptive radiation
C. balanced polymorphism
D. allopatric speciation
E. sympatric speciation
3. DNA replication requires all of the following
EXCEPT:
A. primase
B. helicase
C. DNA polymerase
D. topoisomerase
E. small nuclear ribonucleoproteins (snRNPs)
4. A rare genetic defect is characterized by mucus
accumulation in the respiratory passages and
immotile, but flagellated sperm. A defect in which
of the following molecules could be responsible?
A. actin
B. myosin
C. dynein
D. hemoglobin
E. interferon
5. A bacteriophage is a
A. virus that attacks bacteria
B. bacterium that attacks viruses
C. bacterium that attacks eukaryotic cells
D. parasitic bacterium
E. parasitic eukaryotic cell
6. All of the following are end products of the lightdependent reactions of photosynthesis EXCEPT:
A. O2
B. H+
C. C6H12O6
D. ATP
E. NADPH
7. A dominant trait appears in 19% of the individuals
in a population that is in Hardy-Weinberg
equilibrium. What percent of the population in
the next generation is expected to be homozygous
dominant?
A. 1%
B. 9%
C. 18%
D. 19%
E. 81%
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8. Elongation of cells in shoot tips of plants is
promoted by
A. abscisic acid
B. carotene
C. cytokinin
D. ethylene
E. auxin
9. The endosymbiotic theory for the origin of
eukaryotes is supported by all of the following
EXCEPT:
A. Mitochondria and chloroplasts have double
membranes that consist of two lipid bilayers
separated by an intermembrane space.
B. Mitochondria and chloroplasts both
generate ATP.
C. Mitochondria and chloroplasts have a single,
circular DNA molecule without histones.
D. Mitochondria and chloroplasts have
ribosomes that more closely resemble those
of bacteria than of eukaryotes.
E. Mitochondria and chloroplasts divide by a
process that resembles binary fission.
10. Which of the following transmits nerve impulses
between neurons?
A. Cholinesterase
B. Acetylcholine
C. K+
D. Ca2+
E. Synaptonemal complex
11. The frequency of individuals better able to survive
in a new habitat increases in a population over
time. The best explanation for this is
A. mutation
B. natural selection
C. genetic drift
D. gene flow
E. the founder effect
12. A woman with type A blood requires a blood
transfusion. With respect to this trait, all of the
following individuals would have a blood type
with a safe match for this transfusion EXCEPT:
A. an individual with the genotype I
A
I
A
B. an individual with the genotype I
A
i
C. an individual with the genotype ii
D. an individual with the genotype I
A
I
B
E. an individual with type O blood
13. Both menopause and menstrual flow are preceded
by which of the following?
A. a decrease in estrogen production
B. an increase in estrogen production
C. an increase in testosterone production
D. the degeneration of the uterus
E. the degeneration of the pituitary gland
14. A transcription of the DNA sequence
CCCGGAATT would produce which of the
following sequences in mRNA?
A. CCCGGAATT
B. GGGCCTTAA
C. AAATTCCGG
D. UUUAACCAA
E. GGGCCUUAA
15. Cells of most Archaea have all of the following
characteristics EXCEPT:
A. circular chromosomes
B. histones associated with the DNA
C. peptidoglycans in the cell walls
D. introns
E. plasmids
16. A cell contains four pairs of homologous
chromosomes represented by A1/A2 B1/B2 C1/C2
D1/D2. Which of the following represents the
chromosome makeup of a gamete derived from
this cell?
A. A1A2B1B2C1C2D1D2
B. B1B1C1D1
C. A1A2B1B2
D. A1B2C2D2
E. A1C1C2D1
17. Aphids are insects that insert their needlelike
mouthparts into plants. Sometimes, fluid from the
plant tissues passes entirely through the digestive
tract of the aphid and emerges as a small droplet
at its posterior end. The source of this liquid is
probably
A. epidermal cells
B. phloem cells
C. tracheids
D. vessels
E. xylem cells [Show Less]