AP BIO 2020 PRACTICE EXAM 3 MCQ
QUESTIONS AND ANSWERS
Many species of corals are threatened by the increasing temperatures and decreasing
pHpH of ocean waters. One species, Stylophora pistillata, has been found to thrive in
water that is warmer and has a lower pHpH than the water that corals typically thrive in.
Additionally, researchers have found that the tolerance for the new water conditions is
heritable.
Which of the following statements best explains the changes seen in S. pistillata in
response to the changing water conditions? - Correct Answers -The corals' adaptation is
an example of natural selection because the tolerance is in response to a changing
environment and has a genetic basis.
A researcher measured the temperature at which two different samples of double-
stranded DNADNA denature (separate into single strands). Sample 11 denatured at a
significantly lower temperature than sample 22 did. Based on the data, the researcher
claims that the DNADNA in sample 22 is composed of a higher percentage of guanine
and cytosine than the DNADNA in sample 11 is.
Which of the following best supports the researcher's claim? - Correct Answers -
Guanine-cytosine pairs denature at a higher temperature because they have more
hydrogen bonds between them than adenine-thymine pairs do.
Researchers studying the bacterium Escherichia coli split a population of the bacteria
into two samples. Sample 11 was transformed with a plasmid containing a gene that
makes the bacteria resistant to the antibiotic kanamycin. Sample 22 was transformed
with a plasmid lacking the antibiotic resistance gene. A portion of each sample was then
added to growth plates containing just nutrients or growth plates containing nutrients
and kanamycin.
Which of the following claims is best supported by the data in Table 1 ? - Correct
Answers -Only the bacteria that were successfully transformed with the kanamycin
resistance grew on plate 4.
The fertilization of ovules from plant Q by pollen from plant R results in the production of
seeds. What percent of the genes in each offspring's chloroplasts will have been
inherited from plant R? - Correct Answers -0%
, High levels of certain plant nutrients in runoff can lead to rapid growth of algae (an algal
bloom) in aquatic ecosystems. These algal blooms are generally followed by algal death
and decomposition, which consumes large amounts of dissolved oxygen in the water
and results in oxygen levels insufficient to support aerobic respiration. This process is
known as eutrophication. The amount of algae present in a body of water can be
estimated from the amount of chlorophyll a in a sample of the water. A researcher
studying eutrophication collected samples at different times of the year in a freshwater
ecosystem. The samples were analyzed for total nitrogen and chlorophyll a
concentration (Figure 1) as well as total phosphorus and chlorophyll a concentration
(Figure 2).
Which of the following best explains how higher concentrations of nitrogen and
phosphorus contribute to eutrophication? - Correct Answers -Algae require nitrogen and
phosphorus to build macromolecules, so higher concentrations of these nutrients can
result in algal blooms.
High levels of certain plant nutrients in runoff can lead to rapid growth of algae (an algal
bloom) in aquatic ecosystems. These algal blooms are generally followed by algal death
and decomposition, which consumes large amounts of dissolved oxygen in the water
and results in oxygen levels insufficient to support aerobic respiration. This process is
known as eutrophication. The amount of algae present in a body of water can be
estimated from the amount of chlorophyll a in a sample of the water. A researcher
studying eutrophication collected samples at different times of the year in a freshwater
ecosystem. The samples were analyzed for total nitrogen and chlorophyll a
concentration (Figure 1) as well as total phosphorus and chlorophyll a concentration
(Figure 2).
Which of the following was the dependent variable in the researcher's study? - Correct
Answers -The concentration of chlorophyll a
High levels of certain plant nutrients in runoff can lead to rapid growth of algae (an algal
bloom) in aquatic ecosystems. These algal blooms are generally followed by algal death
and decomposition, which consumes large amounts of dissolved oxygen in the water
and results in oxygen levels insufficient to support aerobic respiration. This process is
known as eutrophication. The amount of algae present in a body of water can be
estimated from the amount of chlorophyll a in a sample of the water. A researcher
studying eutrophication collected samples at different times of the year in a freshwater
ecosystem. The samples were analyzed for total nitrogen and chlorophyll a
concentration (Figure 1) as well as total phosphorus and chlorophyll a concentration
(Figure 2).
Which of the following describes the relationship between the amount of chlorophyll a in
a water sample and the concentration of nitrogen in that sample? - Correct Answers -
The concentrations of nitrogen and chlorophyll a are directly correlated.
QUESTIONS AND ANSWERS
Many species of corals are threatened by the increasing temperatures and decreasing
pHpH of ocean waters. One species, Stylophora pistillata, has been found to thrive in
water that is warmer and has a lower pHpH than the water that corals typically thrive in.
Additionally, researchers have found that the tolerance for the new water conditions is
heritable.
Which of the following statements best explains the changes seen in S. pistillata in
response to the changing water conditions? - Correct Answers -The corals' adaptation is
an example of natural selection because the tolerance is in response to a changing
environment and has a genetic basis.
A researcher measured the temperature at which two different samples of double-
stranded DNADNA denature (separate into single strands). Sample 11 denatured at a
significantly lower temperature than sample 22 did. Based on the data, the researcher
claims that the DNADNA in sample 22 is composed of a higher percentage of guanine
and cytosine than the DNADNA in sample 11 is.
Which of the following best supports the researcher's claim? - Correct Answers -
Guanine-cytosine pairs denature at a higher temperature because they have more
hydrogen bonds between them than adenine-thymine pairs do.
Researchers studying the bacterium Escherichia coli split a population of the bacteria
into two samples. Sample 11 was transformed with a plasmid containing a gene that
makes the bacteria resistant to the antibiotic kanamycin. Sample 22 was transformed
with a plasmid lacking the antibiotic resistance gene. A portion of each sample was then
added to growth plates containing just nutrients or growth plates containing nutrients
and kanamycin.
Which of the following claims is best supported by the data in Table 1 ? - Correct
Answers -Only the bacteria that were successfully transformed with the kanamycin
resistance grew on plate 4.
The fertilization of ovules from plant Q by pollen from plant R results in the production of
seeds. What percent of the genes in each offspring's chloroplasts will have been
inherited from plant R? - Correct Answers -0%
, High levels of certain plant nutrients in runoff can lead to rapid growth of algae (an algal
bloom) in aquatic ecosystems. These algal blooms are generally followed by algal death
and decomposition, which consumes large amounts of dissolved oxygen in the water
and results in oxygen levels insufficient to support aerobic respiration. This process is
known as eutrophication. The amount of algae present in a body of water can be
estimated from the amount of chlorophyll a in a sample of the water. A researcher
studying eutrophication collected samples at different times of the year in a freshwater
ecosystem. The samples were analyzed for total nitrogen and chlorophyll a
concentration (Figure 1) as well as total phosphorus and chlorophyll a concentration
(Figure 2).
Which of the following best explains how higher concentrations of nitrogen and
phosphorus contribute to eutrophication? - Correct Answers -Algae require nitrogen and
phosphorus to build macromolecules, so higher concentrations of these nutrients can
result in algal blooms.
High levels of certain plant nutrients in runoff can lead to rapid growth of algae (an algal
bloom) in aquatic ecosystems. These algal blooms are generally followed by algal death
and decomposition, which consumes large amounts of dissolved oxygen in the water
and results in oxygen levels insufficient to support aerobic respiration. This process is
known as eutrophication. The amount of algae present in a body of water can be
estimated from the amount of chlorophyll a in a sample of the water. A researcher
studying eutrophication collected samples at different times of the year in a freshwater
ecosystem. The samples were analyzed for total nitrogen and chlorophyll a
concentration (Figure 1) as well as total phosphorus and chlorophyll a concentration
(Figure 2).
Which of the following was the dependent variable in the researcher's study? - Correct
Answers -The concentration of chlorophyll a
High levels of certain plant nutrients in runoff can lead to rapid growth of algae (an algal
bloom) in aquatic ecosystems. These algal blooms are generally followed by algal death
and decomposition, which consumes large amounts of dissolved oxygen in the water
and results in oxygen levels insufficient to support aerobic respiration. This process is
known as eutrophication. The amount of algae present in a body of water can be
estimated from the amount of chlorophyll a in a sample of the water. A researcher
studying eutrophication collected samples at different times of the year in a freshwater
ecosystem. The samples were analyzed for total nitrogen and chlorophyll a
concentration (Figure 1) as well as total phosphorus and chlorophyll a concentration
(Figure 2).
Which of the following describes the relationship between the amount of chlorophyll a in
a water sample and the concentration of nitrogen in that sample? - Correct Answers -
The concentrations of nitrogen and chlorophyll a are directly correlated.
