Biology Praxis Exam Study Questions With
Correct Answers
A researcher hypothesizes that lectures do not convey information as well as
| | | | | | | | | | | |
written passages in a textbook do. The researcher separates 48 college freshman
| | | | | | | | | | | |
volunteers into two groups of 24, with an equal number of males and females in
| | | | | | | | | | | | | | |
each group. One group hears a passage repeated three times over a two-minute
| | | | | | | | | | | | |
period. The second group reads the same passage for two minutes. All test
| | | | | | | | | | | | |
subjects are then asked to write down as much as they remember of the passage.
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Which of the following is the independent variable in the experiment? - CORRECT
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ANSWER✔✔-The method by which the passage is presented to the test subjects
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Human skin color, height, and weight depend on the interaction of the products
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of multiple genes. These and other polygenic traits typically exhibit - CORRECT
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ANSWER✔✔-continuous variation |
Which of the following properties of water is responsible for the solubility of
| | | | | | | | | | | | |
many molecules in aqueous fluids such as blood and urine? - CORRECT
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ANSWER✔✔-The polarity of water molecules | | | |
Which of the following correctly matches a phylum with the most common mode
| | | | | | | | | | | | |
of excretion by organisms in the phylum? - CORRECT ANSWER✔✔-Annelida . .
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metanephridia
Which of the following is the best example of habitat fragmentation? - CORRECT
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ANSWER✔✔-Building a highway though a forest | | | | |
,Which of the following best explains why the body makes a more rapid and
| | | | | | | | | | | | | |
stronger response to an infecting pathogen after vaccination against the
| | | | | | | | | |
pathogen? - CORRECT ANSWER✔✔-Memory lymphocytes made in response to
| | | | | | | | |
the vaccination are activated.
| | |
Which of the following enzyme types is most likely responsible for the cleavage of
| | | | | | | | | | | | |
the plasmid shown above? - CORRECT ANSWER✔✔-Restriction endonuclease
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To study the inheritance of wing size in fruit flies, true-breeding female flies with
| | | | | | | | | | | | | |
large wings were crossed with male flies with miniature wings (Cross 1). The F1
| | | | | | | | | | | | | |
progeny were then crossed. The reciprocal parental cross (Cross 2) was also
| | | | | | | | | | | |
performed, and the F1 progeny were crossed. The crosses and the results are
| | | | | | | | | | | | |
summarized in the table above. Based on the data, which TWO of the following
| | | | | | | | | | | | | |
statements are most likely correct? - CORRECT ANSWER✔✔-1.The gene for wing
| | | | | | | | | | |
size is sex-linked.
| |
2. The allele for miniature wings is recessive to the allele for large wings.
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Scientists predict that a particular coastal village in Alaska will be underwater by
| | | | | | | | | | | | |
the year 2025. Which of the following is most likely contributing to the
| | | | | | | | | | | | |
submergence of the village? - CORRECT ANSWER✔✔-Global climate change is
| | | | | | | | | |
thinning Arctic sea ice and raising sea levels
| | | | | | |
Which of the following plant structures most likely contains sclerenchyma cells? -
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CORRECT ANSWER✔✔-The pericarp of a hazelnut
| | | | |
, Which of the following best describes scientific evidence? - CORRECT
| | | | | | | | | |
ANSWER✔✔-It can be used to support or reject a hypothesis. | | | | | | | | |
A scientist examining fossils of small rodents at a particular location found fossils
| | | | | | | | | | | | |
of one species in a deep stratum and found fossils of a similar but distinct more
| | | | | | | | | | | | | | | |
recent species in the stratum immediately above. Fossils of transitional organisms
| | | | | | | | | |
were not found. Of the following, which is the best explanation of the observed
| | | | | | | | | | | | | | |
distribution of fossils in the strata? - CORRECT ANSWER✔✔-There was a brief and
| | | | | | | | | | | |
rapid time of evolutionary change in the older species, so few fossils of
| | | | | | | | | | | | | |
transitional organisms exist. | |
The graph above shows the population sizes of two species of rodents‚ R and S‚ in
| | | | | | | | | | | | | | |
a particular area over time. At the point indicated by the arrow‚ 500 individuals
| | | | | | | | | | | | | | |
of species S were released into the area. Population sizes of the two species were
| | | | | | | | | | | | | |
monitored over the next 20 years. Based on the data‚ which of the following
| | | | | | | | | | | | | | |
conclusions is most likely correct about the two rodent species in the area? -
| | | | | | | | | | | | | |
CORRECT ANSWER✔✔-Species R and S occupy different niches.
| | | | | | |
The molecules of electron transport chains are found in which of the labeled
| | | | | | | | | | | | |
locations of the organelle represented above? - CORRECT ANSWER✔✔-C
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Which of the following best describes the difference between natural selection
| | | | | | | | | | |
and artificial selection? - CORRECT ANSWER✔✔-Environmental conditions drive
| | | | | | | |
natural selection, whereas humans determine artificial selection.
| | | | | |
Transmissible spongiform encephalopathies (TSE) are a family of
| | | | | | | |
neurodegenerative disorders caused by prions. Prions are infectious misfolded | | | | | | | | |
protein sequences that can enter cells and alter the folding of normal cellular
| | | | | | | | | | | | |
prion proteins. A student claims that prions are living organisms because they are
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Correct Answers
A researcher hypothesizes that lectures do not convey information as well as
| | | | | | | | | | | |
written passages in a textbook do. The researcher separates 48 college freshman
| | | | | | | | | | | |
volunteers into two groups of 24, with an equal number of males and females in
| | | | | | | | | | | | | | |
each group. One group hears a passage repeated three times over a two-minute
| | | | | | | | | | | | |
period. The second group reads the same passage for two minutes. All test
| | | | | | | | | | | | |
subjects are then asked to write down as much as they remember of the passage.
| | | | | | | | | | | | | |
Which of the following is the independent variable in the experiment? - CORRECT
| | | | | | | | | | | | |
ANSWER✔✔-The method by which the passage is presented to the test subjects
| | | | | | | | | | | |
Human skin color, height, and weight depend on the interaction of the products
| | | | | | | | | | | | |
of multiple genes. These and other polygenic traits typically exhibit - CORRECT
| | | | | | | | | | | |
ANSWER✔✔-continuous variation |
Which of the following properties of water is responsible for the solubility of
| | | | | | | | | | | | |
many molecules in aqueous fluids such as blood and urine? - CORRECT
| | | | | | | | | | | |
ANSWER✔✔-The polarity of water molecules | | | |
Which of the following correctly matches a phylum with the most common mode
| | | | | | | | | | | | |
of excretion by organisms in the phylum? - CORRECT ANSWER✔✔-Annelida . .
| | | | | | | | | | | |
metanephridia
Which of the following is the best example of habitat fragmentation? - CORRECT
| | | | | | | | | | | | |
ANSWER✔✔-Building a highway though a forest | | | | |
,Which of the following best explains why the body makes a more rapid and
| | | | | | | | | | | | | |
stronger response to an infecting pathogen after vaccination against the
| | | | | | | | | |
pathogen? - CORRECT ANSWER✔✔-Memory lymphocytes made in response to
| | | | | | | | |
the vaccination are activated.
| | |
Which of the following enzyme types is most likely responsible for the cleavage of
| | | | | | | | | | | | |
the plasmid shown above? - CORRECT ANSWER✔✔-Restriction endonuclease
| | | | | | | |
To study the inheritance of wing size in fruit flies, true-breeding female flies with
| | | | | | | | | | | | | |
large wings were crossed with male flies with miniature wings (Cross 1). The F1
| | | | | | | | | | | | | |
progeny were then crossed. The reciprocal parental cross (Cross 2) was also
| | | | | | | | | | | |
performed, and the F1 progeny were crossed. The crosses and the results are
| | | | | | | | | | | | |
summarized in the table above. Based on the data, which TWO of the following
| | | | | | | | | | | | | |
statements are most likely correct? - CORRECT ANSWER✔✔-1.The gene for wing
| | | | | | | | | | |
size is sex-linked.
| |
2. The allele for miniature wings is recessive to the allele for large wings.
| | | | | | | | | | | | |
Scientists predict that a particular coastal village in Alaska will be underwater by
| | | | | | | | | | | | |
the year 2025. Which of the following is most likely contributing to the
| | | | | | | | | | | | |
submergence of the village? - CORRECT ANSWER✔✔-Global climate change is
| | | | | | | | | |
thinning Arctic sea ice and raising sea levels
| | | | | | |
Which of the following plant structures most likely contains sclerenchyma cells? -
| | | | | | | | | | | |
CORRECT ANSWER✔✔-The pericarp of a hazelnut
| | | | |
, Which of the following best describes scientific evidence? - CORRECT
| | | | | | | | | |
ANSWER✔✔-It can be used to support or reject a hypothesis. | | | | | | | | |
A scientist examining fossils of small rodents at a particular location found fossils
| | | | | | | | | | | | |
of one species in a deep stratum and found fossils of a similar but distinct more
| | | | | | | | | | | | | | | |
recent species in the stratum immediately above. Fossils of transitional organisms
| | | | | | | | | |
were not found. Of the following, which is the best explanation of the observed
| | | | | | | | | | | | | | |
distribution of fossils in the strata? - CORRECT ANSWER✔✔-There was a brief and
| | | | | | | | | | | |
rapid time of evolutionary change in the older species, so few fossils of
| | | | | | | | | | | | | |
transitional organisms exist. | |
The graph above shows the population sizes of two species of rodents‚ R and S‚ in
| | | | | | | | | | | | | | |
a particular area over time. At the point indicated by the arrow‚ 500 individuals
| | | | | | | | | | | | | | |
of species S were released into the area. Population sizes of the two species were
| | | | | | | | | | | | | |
monitored over the next 20 years. Based on the data‚ which of the following
| | | | | | | | | | | | | | |
conclusions is most likely correct about the two rodent species in the area? -
| | | | | | | | | | | | | |
CORRECT ANSWER✔✔-Species R and S occupy different niches.
| | | | | | |
The molecules of electron transport chains are found in which of the labeled
| | | | | | | | | | | | |
locations of the organelle represented above? - CORRECT ANSWER✔✔-C
| | | | | | | |
Which of the following best describes the difference between natural selection
| | | | | | | | | | |
and artificial selection? - CORRECT ANSWER✔✔-Environmental conditions drive
| | | | | | | |
natural selection, whereas humans determine artificial selection.
| | | | | |
Transmissible spongiform encephalopathies (TSE) are a family of
| | | | | | | |
neurodegenerative disorders caused by prions. Prions are infectious misfolded | | | | | | | | |
protein sequences that can enter cells and alter the folding of normal cellular
| | | | | | | | | | | | |
prion proteins. A student claims that prions are living organisms because they are
| | | | | | | | | | | |
