Directions (1–30): For each statement or question, select the word or expression that, of those given, best completes the statement or answers the question.
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Part B–1
Directions (31–43): For each statement or question, select the word or expression that, of those given, best completes the statement or answers the question.
Question 31
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Question 32
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Question 33
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Base your answers to questions 34 and 35 on the diagram and information below and on your knowledge of biology.
The diagram below represents the interaction of a human cell and the hormone, insulin, that maintains a healthy blood glucose level in the body.
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Question 36
36.
Base your answers to questions 37 and 38 on the diagram and information below and on your knowledge of biology.
Gray wolves have been identified as a keystone species, which is a species that is critical to the health of the Yellowstone ecosystem.
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Question 39
39.
Base your answers to questions 40 and 41 on the information below and on your knowledge of biology.
In the 1990s, ranchers on Maggie Creek in Nevada moved the areas where their cattle were grazing. The move was done to help vegetation regrow on the banks of the creek, which had been eroding due to lack of vegetation. After the move, vegetation began to return to the creek banks. The graph below shows the changes in the amount of green vegetation from 1985 to 2016.
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Base your answer to question 42 on the information below and on your knowledge of biology.
PCBs in the Environment
PCBs are chemicals once used in electrical equipment. Their use has now been banned because PCBs have been found to cause cancer. These harmful chemicals made their way into the ocean and have accumulated in the tissues of organisms. Beginning with the producers, the levels of PCBs become more concentrated as larger organisms eat smaller ones. It has been shown that organisms higher in the food chain contain the greatest levels of PCBs.
A student examined the diagram below of an Antarctic food web and made the claim that the greatest concentration of PCBs would be found in leopard seals.
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Question 43
43.
Part B–2
Directions (44–55): For those questions that are multiple choice, select the choice that, of those given, best completes each statement or answers each question. For all other questions in this part, follow the directions given and record your answers in the spaces provided.
Base your answer to question 44 on the diagram below and on your knowledge of biology. The diagram represents an evolutionary pathway for certain organisms over many years.
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Question 44
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Base your answer to question 49 on the graph below and on your knowledge of biology.
The graph shows the effects of stopping smoking at different ages along with the cumulative risk (%) of death from lung cancer up to age 75 in men. The study took place in the United Kingdom.
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Base your answers to questions 50 and 51 on the diagram below and on your knowledge of biology. The diagram represents the reproductive systems of the human female and male.
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Question 52
52.
Detritivores are animals that consume and break down dead plant and animal matter from ecosystems. Explain why the decline and extinction of many species of detritivores may have negative consequences on the stability of an ecosystem.
Base your answers to questions 53 and 54 on the information and photograph below and on your knowledge of biology.
A research team of students added water and an experimental enzyme to a jar containing a piece of the type of plastic that is commonly used in food packaging. Several days later, the plastic was no longer visible.
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Base your answer to question 55 on the information below and on your knowledge of biology.
Ultrasonic repellents are electronic devices designed to repel and remove household pests. When plugged in, they produce ultrahigh-frequency sound waves to chase away mice, rats, fleas, cockroaches, silverfish, and spiders. The sound these devices make cannot be heard by humans. These pest-control devices are often used in environments where the use of poison is prohibited or not recommended.
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Part C
Directions (56–72): Record your answers in the spaces provided.
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Base your answer to question 58 on the information below and on your knowledge of biology.
A Scorpion’s Secret Weapon Ingredient
Getting stung by a scorpion is painful. The pain serves as a warning to its predators to stay away.
Scorpion venom contains toxins that are recognized by the pain receptors on nerve cells. These receptors are the same as those that cause a burning feeling when you touch something hot. But, being stung by a scorpion is much more painful than touching a hot object.
The venom itself doesn’t cause all of the pain. It also contains an acid that changes the pH of the area surrounding the affected nerve cells. The change in pH increases the intensity of the pain message.
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Base your answers to questions 59 through 61 on the information below and on your knowledge of biology.
Scientists have studied the medicinal herb, Fritillaria delavayi (fritillary), which is very difficult to cultivate. This herb is used in Chinese traditional medicine to treat lung conditions such as bronchitis and bad coughs. This threatened herb grows wild among the rocks in dry, cold, mountainous places in China. Most fritillary have bright green leaves and sunny yellow flowers. The scientists have noticed something unusual: In places where people often gather and harvest the herb, more and more plants of the same species have a dull brown flower color. Many people have trouble finding this dull brown variety that blends in with the rocky area where it grows.
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Three different food chains present in a food web are represented below.
(b) saguaro cactus → wood rat → western diamondback rattlesnake
(c) brittlebrush → grasshopper mouse
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Base your answers to questions 63 and 64 on the information below and on your knowledge of biology.
Woman Gives Birth After Uterus Transplant
Women with uterine factor infertility (UFI) either don’t have a uterus or have a uterus that doesn’t function. A uterus transplant has emerged as a potential solution for these women. In 2019, the first baby in North America was delivered by a mother who received a uterus transplant.
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Base your answers to question 65 on the information and graph below and on your knowledge of biology.
Human actions have affected the biodiversity of multiple ecosystems on Earth.
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Base your answer to question 66 on the diagram below and on your knowledge of biology.
The diagram represents a feedback mechanism in humans.
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Base your answer to question 67 on the information and diagram below and on your knowledge of biology.
The diagram represents two molecules, A and B, resulting from the digestion of foods, moving into a cell.
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Base your answers to questions 71 and 72 on the information below and on your knowledge of biology.
Why Is the Sky White?
One method researchers are investigating to decrease the impact of climate change is stratospheric aerosol scattering. This involves using airplanes or balloons to spray tiny particles of sulfate aerosols or calcium carbonate into the upper atmosphere. The particles reflect sunlight back into space.
Climate modeling has shown that the use of this technology could lead to a decrease in extreme temperatures and the intensity of tropical storms. It could also reduce ice loss and sea-level rise as well.
However, there are risks associated with this technology. While the models show global benefits, local benefits might vary considerably. Also, since this technology doesn’t address carbon emissions, as it continues to get warmer there will be a need to spray more and more particles into the atmosphere. This could change the appearance of the sky from blue to white. There are also concerns that introducing sulfate aerosols into the upper atmosphere could damage the ozone layer.
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Part D
Directions (73–85): For those questions that are multiple choice, select the choice that, of those given, best completes each statement or answers each question. For all other questions in this part, follow the directions given and record your answers in the spaces provided.
Question 73
73.
Question 74
74.
Base your answers to questions 75 through 77 on the information and diagram below and on your knowledge of biology.
The diagram represents evolutionary pathways of seven groups of organisms alive today.
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Question 78
78.
When determining a pulse rate, why is it best to use the average of three readings?
Base your answer to question 79 on the information below and on your knowledge of biology.
Selecting agents can have a significant impact on the size of many populations living in an area.
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Base your answer to question 80 on the information below and on your knowledge of biology.
Pulse-rate data were collected from some students during their study hall. The data are shown in the histogram below.
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Question 81
81.
Base your answers to questions 82 and 83 on the information below and on your knowledge of biology.
A student was assigned the task of determining which of three species of plant (species L, M, or N) was most closely related to Botana curus (BC).
The student compared a segment of genetic material from each species using the procedure represented below.
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Question 84
84.
During physical activity, a person’s pulse rate changes. Choose one body system, other than circulatory, that would be involved in maintaining homeostasis, and describe one change that would occur in that system.
Base your answer to question 85 on the diagram below and on your knowledge of biology.
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When you cut your finger, new skin quickly grows that repairs and replaces the damaged skin cells. Information directing this process is located in the
mitochondria in neighboring skin cells, which provide the energy needed for mitotic cell division
mitochondria in neighboring skin cells, which provide the energy needed for meiotic cell division
DNA of neighboring cells, which divide by mitotic cell division
DNA of neighboring cells, which divide by meiotic cell division
ATP is produced in the
vacuoles
nuclei
mitochondria
ribosomes
Some trees release toxins into the soil that can kill the plants nearby. This ability can best be described as
a means of establishing a consistent soil pH
a benefit to the ecosystem, since it results in increased biodiversity
a trait acquired by the species to eliminate the consumers that feed on them
an evolutionary advantage, reducing competition for water, nutrients, and sunlight
When the frequency of a gene in a population changes, the most likely result would be
ecological succession
biological evolution
species extinction
genetic mutation
During the 1880s, in an attempt to control the rat population, the Asian mongoose was brought to the Hawaiian Islands. However, there was a flaw in the plan. Rats are active at night, while mongooses feed on birds and eggs during the day. They had little effect on the rat population. The mongoose population rapidly increased and caused the extinction of many bird species native to the islands.
Bringing mongooses to the Hawaiian Islands is an example of
a technological fix to solve problems caused by population growth
developing a research plan to study unintended outcomes
humans altering ecosystems, resulting in unintended consequences
an imported species solving an ecological problem
Many companies today are looking for ways to reduce the use of finite resources. They are working to recycle, reuse, and repair more products to reduce dumping and pollution. Which statement best describes a positive result of these changes?
Fossil fuels will be renewed for future generations to utilize.
Finite resources will not be depleted as quickly.
These activities can result in unstable ecosystems.
Destruction of ecosystems will result in a loss of biodiversity.
Which characteristic would give one species the greatest advantage over other species?
higher number of surviving offspring
lower number of matings
lower adaptation to the environment
higher rate of disease
The diagram below represents the same location over a period of many years.
As a result of these changes,
biodiversity in the area decreases
the community becomes more stable
the community becomes less stable
biodiversity is not affected
Between 1880 and 2020, Earth’s temperature increased slightly more than 1°C.
The best explanation for this increase is
a decrease in the amount of sunlight reaching Earth each year
an increase in the amount of solar radiation reflected back into space
changing concentrations of gases in the atmosphere
volcanic activity releasing ash and dust into the atmosphere
Two different species of animal prefer the same plant for food. One eats the leaves of the plant, the other prefers the fruit. By eating different parts of the same plant these species can successfully coexist because they do not
compete for limited resources
live in the same area
reproduce at the same time of year
interact in a predator-prey relationship
Different techniques are used to study cells. Fluorescent (glowing) tags allow scientists to visualize specific proteins as they are synthesized inside cells. Which part of a cell would be studied when using this technology to visualize protein synthesis?
nucleus
ribosome
cell wall
cell membrane
The image below shows a recently discovered fossil of an unhatched egg of a theropod dinosaur. The dinosaur is in a prehatching position similar to bird embryos in unhatched eggs today. Prior to finding the fossil, this behavior was never seen in animals other than birds.
The fact that both theropod dinosaurs and birds share this behavior is evidence that
birds and theropod dinosaurs are related and share a common ancestor
animals that develop in eggs must use this behavior to survive
this behavior decreases reproductive success
behaviors like this must be learned from parents
The graph below represents the amount of stored energy in each level of an energy pyramid.
The amount of stored energy between level 1 and level 4 decreases because
there are more organisms at level 4
level 1 has more consumers
at each level some energy is released as heat
there are more producers at each level
In a sexually reproducing species of plant, which change could occur that would have an effect on the species in the future?
changes in the egg cells in the ovaries of the plants’ flowers
variations that occur in the root cells of the plants in a field
differences in leaf cells that are exposed to solar radiation
a change in the DNA sequence caused by ultraviolet radiation in the cells of the plants’ stems
Many factors go into producing goods that are used by people in their everyday lives. In manufacturing, the production of goods and use of energy
is always positive because it is the only way for goods to be produced
can only be negative because it generates a lot of pollution
is neither positive nor negative because the energy is necessary
can have both positive and negative effects
The illustration below represents two cellular processes, A and B.
Select the row in the table that correctly identifies the cellular process.
Row1
Row 2
Row 3
Row 4
A food web is represented below.
A chemical was introduced into this environment that caused a decrease in the population of mice. This would most likely cause
an increase in the deer population
an increase in the shrub population
a decrease in the tree population
a decrease in the snake population
Populations of organisms making up an Arctic food chain are represented below.
Which statement concerning this food chain is the most accurate?
The greatest amount of energy in this food chain is located in the polar bear population.
Zooplankton, which provide food for the cod, are the main producers in this chain.
A reduction in the algae populations would most likely affect the survival of all the other populations in this food chain.
The organisms in this chain can all produce their own energy during long periods of cold weather
The protein in a hamburger is broken down into amino acids. Which two processes are involved in the breakdown of the protein and the absorption of the amino acids into the bloodstream?
synthesis and mitosis
digestion and diffusion
mitosis and digestion
active transport and replication
Tuatara are the last survivors of an ancient group of reptiles that lived at the same time as the dinosaurs. Tuatara contain a very large genome. The genome, its complete set of genes, is about two-thirds bigger than the human genome.
One possible explanation for why the tuatara has survived since prehistoric times is that their large genome
has enabled them to live on a part of Earth that has not gone through any environmental changes since the time of the dinosaurs
provided the members of the species with characteristics that gave them advantages for survival in changing environments
can mutate when the species needs to develop characteristics that will adapt the members to live in areas that are very cold or very warm
can rearrange genes so that the species evolves when environmental changes occur
Two primary chemical messengers used in communication within the human body include
antibodies and pathogens
organic catalysts and toxins
enzymes and antigens produced by body cells
hormones and chemicals produced by nerve cells
Holstein cows have become the most widespread breed of dairy cow in the United States. They have been selectively bred to have many characteristics beneficial to dairy farmers. Holsteins are known for their ability to produce large quantities of milk. In addition, they are often calm and agreeable animals.
Which statement best describes a potential risk of the selective breeding process to future generations of Holstein dairy cows?
Genetic diversity in the breed may become limited over time.
It increases the chances of having even more desired characteristics.
It results in many highly productive and longlived animals.
It improves the health of future generations of Holstein cattle.
An organism that normally has 32 chromosomes in its body cells is found to be producing gametes with either 15 or 17 chromosomes. It has not been able to successfully reproduce. The most likely reason for its inability to reproduce would be errors during the process of
mitosis
differentiation
meiosis
cloning
Which sequence correctly identifies the flow of energy through an ecosystem?
producers → consumer → herbivore
consumer → decomposer → producer
carnivore → herbivore → producer
producer → consumer → decomposer
An ameba, which is a single-celled aquatic organism, is represented below.
Which of the ameba's cell structures is the most important in obtaining oxygen from its environment?
cell membrane
ribosome
mitochondrion
cell wall
The diagram below represents a specialized gamete that plays a role in human reproduction.
The proper functioning of cells like these is vital for human reproduction because
its mitochondria provide the nutrition to support the embryo
the tail makes it possible to deliver all the genetic information needed in a zygote
the cell differentiates to form specialized structures such as tissues and organs
its nucleus carries half the genetic information needed to form a zygote
If the amounts of carbon dioxide and water available increase, it is most likely that the first response by the producer organisms would be to
increase glucose synthesis
increase DNA synthesis
decrease amino acid synthesis
decrease nucleic acid synthesis
There are high numbers of stray and feral cats in communities across the United States. In order to humanely control these cat populations, many areas are participating in programs to trap, spay, and release the animals. When a female cat is spayed, organs are surgically removed to prevent the animal from being able to reproduce. Which two organs are most likely removed from the female cat during this surgery?
uterus and placenta
ovaries and uterus
ovaries and stomach
placenta and testes
When you purchase a fishing license in New York State, you are told to check the Advisory Tables before consuming any of the fish you catch. The tables list the fish species you should not eat and others you can eat up to four times per month, due to the presence of toxic chemicals in the fish.
A likely reason the table recommends that children under the age of 15 and young women should not eat any of the fish caught in some bodies of water is that
young women and children already have a large amount of these chemicals in their bodies
the chemicals may affect their development or harm potential unborn children
the chemicals do not affect males, so they can eat up to four of the fish per month
the fish species on the list are in danger of extinction
Examples of two abiotic resources present in an ecosystem are
nitrogen and carbon dioxide in the atmosphere
animal species and water
the plant species and soil minerals
populations of decomposers and pH of the soil
Organisms A and B represent microorganisms viewed through a microscope. Although both seem to occupy the same field of view, which organism is actually larger?
A is larger since it fills the field of view at low magnification.
B is larger since the magnification is lower.
A is larger since the magnification is higher.
B is larger since it fills the field of view at high magnification.
The data represented in the graph below show differences in the concentration of carbon dioxide (CO2) in the atmosphere during the summer and winter months.
Which statement best explains why these differences occur?
The rate of respiration in plants increases during the summer, releasing more CO2 into the atmosphere.
The activity of decomposers increases during the winter months, removing large amounts of CO2 from the atmosphere.
The increased exposure of plants to sunlight during the winter results in increased CO2 production.
The activity of autotrophs increases during the summer, removing CO2 from the atmosphere.
Altering the DNA of a muscle cell in a mouse by substituting one base pair with another could likely
change all the DNA sequences in the mouse
change one amino acid in a protein a muscle cell produces
alter the carbohydrates that the muscle cells’ ribosomes produce
alter the DNA of the offspring of the mouse
Question 34
34.
Question 35
35.
Two different human disorders are compared in the table below.
Which statement describes the patterns of inheritance for these two disorders?
The blood disorder is not inherited but the skin disorder is inherited.
Both the blood and skin disorders are not inherited but can be passed to offspring.
The blood disorder can be inherited, and there are factors associated with the skin disorder that may be inherited.
Both the blood and skin disorders can be inherited, with offspring always showing symptoms associated with the disorders.
Question 37
37.
Question 38
38.
Hydrangeas are plants with flowers that can change color. If the pH of the soil in which the plants are growing is altered, the flower color can vary from pink to blue. What is the best explanation for this phenomenon?
The genes of the hydrangea plants are mutated by the change in pH.
Some of the genes of the hydrangea plants die off due to the pH change.
The genes of the hydrangea plants can be turned on and off by different soil pH levels.
The genes of the hydrangea plant change chromosomes with different soil pH levels.
Question 40
40.
Question 41
41.
Question 42
42.
C. explodens, a species of ant that resides in the tropical jungles of Borneo, can explode when their nest is threatened. The nests contain adult ants, eggs, and larvae. When an adult ant comes in contact with an enemy ant, the C. explodens ant latches onto it and squeezes its own abdominal muscles until its abdomen bursts open, releasing a toxic goo.
Which statement best describes this phenomenon?
The ants needed a way to protect their offspring, so they developed a way to release a toxic goo to kill enemies.
This behavior has resulted in greater reproductive success of the ants, since it kills the enemies who would have fed on their offspring.
The offspring of the ants will not inherit the exploding abdomen trait because this trait is not genetic.
The ant species will likely become extinct, since most of them die while protecting the nest.
Identify the organism in the diagram that became extinct about 60 million years ago.
Base your answers to questions 45 through 48 on the information below and on your knowledge of biology.
The Common Loon
Loons are aquatic birds found on freshwater lakes throughout Canada and the northern part of the United States from early spring through fall. They inhabit lakes over five acres in size, with clear water and a good supply of fish for food. They migrate to coastal areas for the winter.
In most states where loons are found, they are at risk of becoming extinct and require management to ensure the health of the population. To help keep track of how many loons are living on specific lakes, state wildlife specialists train volunteer citizen scientists how to monitor loon populations during breeding season. This provides additional data that helps researchers determine loon population trends and factors affecting their survival. During the breeding season, a pair of loons typically produces one or two chicks per year. The chicks are slow to mature. They are usually seven years old before their first successful breeding season. Loons have dense bones rather than the hollow bones characteristic of most birds. Their wings are comparatively small for their body size. Adults weigh an average of 8–12 lbs. Another trait of loons is their large, webbed feet and legs set far back on their bodies. To fly, they run on top of the water, and flap their wings to gain enough momentum for liftoff. The data table below shows the number of adult loons and chicks counted in the southern part of Maine between 1985 and 2020.
Directions (45–46): Using the information given in the data table, construct a line graph on the grid provided, following the directions below.
Question 45
45.
Mark an appropriate scale on the grid in Question 46, without any breaks in the data, on each labeled axis.
Question 46
46.
Plot the data for both the adults and the chicks following the directions below:
— Plot the data for the loon adults on the grid and connect the points. Surround each point for the loon adults with a small triangle.
— Plot the data for the loon chicks on the grid and connect the points. Surround each point for the loon chicks with a small circle.
Below are two graphs showing the number of loon adults, immature loons, and chicks observed during the annual loon census conducted by the Audubon Society of New York on the lakes and ponds throughout the Adirondack Park in New York State.
Question 47
47.
Question 48
48.
Compare the trend in loon population sizes over time represented in the two New York graphs above to the trend observed in the data table for the southern part of Maine. Support your answer with information from the New York graphs and Maine data table.
Question 49
49.
Question 50
50.
Question 51
51.
Pelvic inflammatory disease and sexually transmitted infections can lead to a blockage of the structure represented by letter A. Explain how this blockage would interfere with the formation of a zygote.
Question 53
53.
Identify one factor that would influence the rate at which the experimental enzyme breaks down this type of plastic.
The research team claimed that the experimental enzyme would break down all plastics. The students repeated the experiment with a different type of plastic. This time, the plastic was not broken down by the enzyme.
Question 54
54.
Explain why the enzyme is not able to break down all types of plastics.
Question 55
55.
Identify one concern, other than its effectiveness, that people might have before using it in their home.
Base your answers to questions 56 and 57 on the information, photograph, and illustration below and on the next page, and on your knowledge of biology.
Mouse DNA and Epigenetics
In 2000, scientists at Duke University designed an experiment using mice that carry a gene for yellow fur color. Mice with the yellow fur gene also have a large appetite and a tendency to develop cancer and diabetes. The photo shows a mouse with the yellow fur gene (on the left) next to a normal mouse with the brown fur gene (on the right).
The scientists wanted to see if they could reduce the chances of the offspring of the yellow mice developing these diseases by changing the expression of the gene for yellow fur color.
They began by changing the diet of yellow female mice to a diet containing food rich in methyl groups. Methyl groups are small clusters of chemicals that can attach to a gene and turn it off. Their offspring, that had methylated DNA, were found to be thin, have brown fur, and had less chance of developing cancer and diabetes.
The model illustrated below shows methylated and non-methylated DNA.
The researchers concluded that the offspring were born with an epigenetic alteration to their DNA. Epigenetic alterations are inheritable changes in gene expression patterns independent of the primary DNA sequence. The expression of the gene is altered but the DNA sequence usually remains unchanged. In addition to diet, other factors such as hormones, physical activity, stress, tobacco, and alcohol use can also cause epigenetic changes.
Question 56
56.
Sometimes identical twins have different physical traits. Using the experiment Duke scientists performed on mice with the yellow fur color gene as a model, explain how epigenetics could be the cause of differences observed in identical twins.
Question 57
57.
Explain why epigenetic changes are not usually considered to be mutations.
Question 58
58.
In a population of scorpions, a mutation occurred that resulted in the venom having no effect on its predators. Explain why the number of predators that feed exclusively on scorpions would decrease over time. Justify your answer.
Question 59
59.
Identify the original source of the brown variation.
Question 60
60.
Fritillary grows very slowly, taking five years to reproduce. Predict which flower color will be more common in areas accessible by humans after 20 years. Support your answer.
Question 61
61.
Human efforts to cultivate this endangered species have not been successful. What argument could be made to justify continued efforts to preserve this species by cultivation?
Question 62
62.
Identify the food chain, (a), (b) or (c), in which there would be the least amount of energy available to the last consumer in the feeding sequence. Support your answer.
Question 63
63.
Describe a role of the uterus in the process of human reproduction.
During pregnancy, the women are given medication to prevent the transplanted uterus from being rejected. After the baby is born, the transplanted uterus is removed.
Question 64
64.
Explain why a woman’s body would reject a transplanted uterus if she does not take the medication.
Question 65
65.
Make a claim as to how human actions have affected biodiversity. Support your claim with evidence from the graph.
Question 66
66.
An individual with a healthy pancreas eats a starchy snack. Explain why the pancreas would secrete more hormone a short time later. Support your answer with information from the diagram.
Question 67
67.
Explain how the lack of nutrients can impact the cellular process needed to move molecule A into this cell.
Base your answers to questions 68 through 70 on the information below and on your knowledge of biology.
Mitochondria
Mitochondria are organelles present in most complex cells. The diagram below illustrates a typical mitochondrion in cells.
Question 68
68.
Explain why mitochondria are essential to the survival of complex organisms.
Unlike most other organelles, mitochondria contain their own DNA. This DNA is in the form of a double-stranded, ring-shaped molecule that can replicate. The number of mitochondria in a cell can increase when mitochondria reproduce.
Mitochondrial DNA mutates. Some of these mutations have been linked to certain diseases in humans. Mitochondrial DNA is passed on to children through their mothers. The chart to the left illustrates this process.
Question 69
69.
Provide evidence from the mitochondrial inheritance chart that supports the claim that mitochondria are usually inherited from the mother.
Different cells in the human body contain different numbers of mitochondria. The chart to the left shows the approximate number of mitochondria present in various cells.
Question 70
70.
State which cell type would probably be most affected by mitochondrial diseases. Support your answer.
Question 71
71.
State one reason for supporting the use of this technology.
Question 72
72.
Explain why it would be important to continue efforts to reduce carbon emissions even if this technology were to be used.
When the proportion of a gene for a specific trait in a population of finches increases over time, the most likely cause of this increase would be
selective breeding
species extinction
natural selection
ecological succession
A scientist conducts an experiment in order to
choose variables
test a hypothesis
collect data
identify a control
Question 75
75.
Question 76
76.
Question 77
77.
The diagram was based on fossil evidence. Explain why other forms of evidence would help support the accuracy of the evolutionary pathways represented in the diagram.
Question 79
79.
Identify one selecting agent that could have a potential impact on the number of individuals in the various penguin populations living in the Antarctic Peninsula.
Question 80
80.
State one way the data would most likely be different if the pulse rates were collected immediately after gym class instead of during study hall.
Ground finches in the Galapagos Islands are seed eaters. The beaks of the offspring are very close in size to the beaks of their parents. The best explanation for this observation is that
a bird with a very small beak will die
the temperature of the environment determines the size of the beak
only birds with very small beaks are able to reproduce
the size of the beak is determined mostly by genes
Question 82
82.
Question 83
83.
Identify another biochemical test that would provide data to support which of the three plant species is most closely related to Botana curus.
Question 85
85.
State one reason why it would be possible for a single island to support populations of both small tree finches and sharp-billed ground finches.
Structure X is best described as a
signal molecule that is attached to the cell wall
protein molecule that releases energy that can be used by the cell
carbohydrate molecule that sends signals to other cells
receptor molecule that allows the cell to respond to changes
Some individuals cannot produce insulin. As a result, their cells will
produce another molecule to take over the function of insulin
synthesize more glucose for energy production
not respond appropriately to changes in blood glucose levels
divide at a faster rate than when insulin is available
The ecosystem will be disrupted with the loss of this keystone species because the loss would lead to
a decrease in the elk population
a decrease in the coyote population
an increase in the plant populations
a decrease in the plant populations
Due to human concerns, wolves were removed from the Yellowstone ecosystem for approximately 70 years, from the 1920s until 1995. Scientists felt that, as a keystone species, it was important to reintroduce the wolves to
increase the stability of the natural environment
limit the use of pesticides to control plant populations
increase the reproductive rate of the elk population
stimulate growth of the coyote population
How many more months did the Maggie Creek area have some green vegetation cover in 2006-2016, compared with the number of months of green cover in 1985-1994?
5 months
7 months
3 months
10 months
The change in the environmental conditions of Maggie Creek over time is an example of how
human actions in one state can cause an ecosystem to develop into a stable grassland community in another state
grazing animals will eventually have a positive environmental effect on the land where they are kept
changing agricultural practices can help to restore environmental stability to certain locations
once humans interfere with environmental factors, stability cannot be restored in an ecosystem
Based on information provided in the Antarctic food web, one reason blue whales may contain a lower concentration of PCBs than killer whales is that blue whales
eat krill, which have a lower accumulation of PCBs than penguins and elephant seals
eat only plants that contain PCBs
are eaten by killer whales that accumulate PCBs from blue whales and other species
do not live as long as killer whales, and therefore their PCB concentration is lower
The best explanation for why loon populations did not show a rapid change in size during the Maine and New York studies is that loons
produce three or four chicks per year
take seven years to reach sexual maturity
live mainly on large lakes
were counted by volunteers, not wildlife experts
Doctors claim that the earlier someone stops smoking, the lower the risk of dying of lung cancer. Which statement best describes evidence that supports this claim?
Men that smoked 40 cigarettes per day have the same risk as smoking 20 cigarettes per day at any age.
Men that continued to smoke had an approximately 16% risk of death, and those that stopped at age 30 had a lower risk.
Men that never smoked had the same risk as those that smoked until the age of 30.
Men that stop smoking at age 40 have a greater risk of bladder cancer than lung cancer.
The two labeled structures that function to produce gametes and hormones are
A and F
B and E
C and H
D and G
Which species is most closely related to species M?
E
F
G
H
Which species appears to have been well adapted to its environment for a long period of time?
E
F
C
D
A valid conclusion that can be drawn from these results is that
genetic material is not useful in determining evolutionary relationships