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AP BIO | 2020 Practice Exam 3 MCQ With Questions And 100% ALL CORRECT ANSWERS
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JACKLINEAP BIO | 2020 Practice Exam 3 MCQ With Questions And 100% ALL CORRECT
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Many species of corals are threatened by the The corals' adaptation is an example of natural selection because the tolerance is in response to a
increasing temperatures and decreasing pH of changing environment and has a genetic basis.
ocean waters. One species, Stylophora pistillata, has
been found to thrive in water that is warmer and has
a lower pH 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?
,A researcher measured the temperature at which Guanine-cytosine pairs denature at a higher temperature because they have more hydrogen bonds
two different samples of double-stranded DNA between them than adenine-thymine pairs do.
denature (separate into single strands). Sample 1
denatured at a significantly lower temperature than
sample 2 did. Based on the data, the researcher
claims that the DNA in sample 2 is composed of a
higher percentage of guanine and cytosine than the
DNA in sample 1 is.
Which of the following best supports the
researcher's claim?
Researchers studying the bacterium Escherichia coli Only the bacteria that were successfully transformed with the kanamycin resistance gene grew on
split a population of the bacteria into two samples. plate 4.
Sample 1 was transformed with a plasmid containing
a gene that makes the bacteria resistant to the
antibiotic kanamycin. Sample 2 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.
After being allowed to grow for 24 hours at 37∘C,
the number of colonies on each growth plate was
counted (Table 1).
TABLE 1. BACTERIAL GROWTH FOLLOWING
TRANSFORMATION WITH ORWITHOUT THE
KANAMYCIN RESISTANCE GENE
Which of the following claims is best supported by
the data in Table 1 ?
The fertilization of ovules from plant Q by pollen 0%
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?
, High levels of certain plant nutrients in runoff can Algae require nitrogen and phosphorus to build macromolecules, so higher concentrations of these
lead to rapid growth of algae (an algal bloom) in nutrients can result in algal blooms.
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?
High levels of certain plant nutrients in runoff can The concentration of chlorophyll a
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?
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