WorksheetsBiology SOL Remediation RC3 - Practice Questions
Total questions: 63
Worksheet time: 32mins
A researcher observes a cell undergoing meiosis. During Prophase I, she notes that homologous chromosomes are exchanging segments of DNA. What is the primary significance of this process?
It ensures that the offspring are genetically identical to the parents.
It increases genetic diversity by creating new combinations of alleles.
It reduces the number of chromosomes to ensure the zygote is diploid.
It prevents harmful mutations from being passed to the next generation.
Which of the following mutations would most likely have the greatest impact on the resulting protein's structure and function?
A substitution mutation in a non-coding region of the DNA.
A silent mutation that results in the same amino acid.
A deletion of a single nucleotide early in the coding sequence.
A substitution that changes one amino acid to another with similar properties.
A mutation occurs in a skin cell of a Golden Retriever due to exposure to high levels of sunlight. Which statement best describes the inheritance of this mutation?
The mutation will be passed to all of the dog's offspring.
The mutation will only be passed to male offspring.
The mutation cannot be passed to offspring because it is in a somatic cell.
The mutation will lead to increased genetic variation in the canine population.
During meiosis, the random orientation of homologous chromosome pairs at the metaphase plate allows for different combinations of maternal and paternal chromosomes in the gametes. This principle is known as:
The Law of Dominance
Independent Assortment
Nondisjunction
The Law of Segregation
A DNA sequence is changed from 5’ - TTA - CGA - 3’ to 5’ - TTA - TGA - 3’. If TGA is a stop codon, what will be the most likely result for the protein?
The protein will be longer than normal.
The protein will be shorter than normal and likely non-functional.
The protein will function normally because only one base was changed.
The protein will have a different amino acid but remain the same length.
Why is sexual reproduction generally more advantageous for the survival of a species in a changing environment than asexual reproduction?
It produces offspring at a much faster rate.
It requires less energy because only one parent is involved.
It produces offspring with greater genetic variety, increasing the chance of adaptation.
It ensures that every offspring has the exact same beneficial traits.
In pea plants, tall (T) is dominant to short (t). If a homozygous tall plant is crossed with a short plant, what percentage of the offspring will be tall?
0%
25%
50%
100%
Which of the following genotypes represents a person who is heterozygous for a trait?
BB
Bb
bb
B
In a certain species of mice, brown fur (B) is dominant over white fur (b). If two heterozygous brown mice are crossed, what is the probability that an offspring will have white fur?
25%
50%
75%
100%
A biologist crosses a plant having red flowers with a plant having white flowers. All of the offspring have red flowers. What does this suggest about the red flower trait?
It is recessive.
It is dominant.
It is a mutation.
It is incomplete dominance.
In humans, freckles (F) are dominant to no freckles (f). If a mother has the genotype Ff and a father has the genotype ff, what are the chances their child will have freckles?
1 out of 4
2 out of 4
3 out of 4
4 out of 4
Which of these describes a phenotype?
Rr
Homozygous
Blue eyes
DNA sequence
A "purebred" (homozygous) recessive purple flower is crossed with a "purebred" (homozygous) dominant white flower. If white is dominant, what will be the genotype of all the offspring?
WW
ww
Ww
WP
If a student performs a cross and finds that 50% of the offspring are Tt and 50% are tt, what were the genotypes of the parents?
TT×tt
Tt×tt
Tt×Tt
tt×tt
In humans, the allele for hemophilia (a blood-clotting disorder) is recessive and located on the X chromosome (Xʰ). A woman who is a carrier (XʰXⁿ) and a man with normal blood clotting (XⁿY) have a child. What is the probability that they will have a son with hemophilia?
0%
25%
50%
100%
A population of birds lives on an island. A sudden volcanic eruption kills 90% of the population. The remaining birds have a different gene pool than the original group. This is an example of —
Natural selection
The bottleneck effect
Gene flow
Artificial selection
Which of the following is the primary source of new genetic variations within a population?
Geographic isolation
Asexual reproduction
Genetic mutations
Competition for food
Which statement best describes "fitness" in evolutionary terms?
The ability of an organism to run the fastest.
The physical strength an organism possesses.
The ability of an individual to survive and produce offspring.
The total number of mutations an organism accumulates.
If a farmer only breeds the cows that produce the most milk, which process is occurring?
Natural selection
Genetic drift
Artificial selection
Geographic isolation
Which of these would most likely increase the genetic variation in a population?
Frequent gene flow from a neighboring population
A massive decrease in population size
Extensive inbreeding within the population
A stable environment with no predators
According to the theory of natural selection, why do some individuals leave more offspring than others?
They have acquired traits through use and disuse during their lives.
They possess inherited adaptations that maximize their fitness.
They were lucky enough to avoid all predators.
They are the largest and most aggressive members of the group.
Which of these is the primary advantage of sexual reproduction over asexual reproduction in a changing environment?
It requires less energy to find a mate.
It produces offspring that are genetically identical to the parent.
It increases the genetic variation within a population.
It allows for a much faster rate of reproduction.
An organism like a bacterium reproduces through binary fission. How does this strategy help the species survive in a stable environment?
A) It allows the population to grow very rapidly.
B) It ensures that offspring have different traits than the parent.
C) It requires two different parents to share DNA.
D) It increases the chance of mutations in every generation.
Sea urchins release thousands of eggs and sperm directly into the ocean water. Which statement best explains why they produce so many gametes?
A) Most gametes will be fertilized and grow into adults.
B) High numbers compensate for low individual survival rates.
C) Internal fertilization requires more gametes than external fertilization.
D) Large numbers of gametes reduce the energy the parent must spend.
A species of bird provides significant parental care, feeding and protecting its young for several months. What is the most likely trade-off for this strategy?
The species must produce a very large number of offspring.
The offspring have a lower chance of survival.
The parent produces only a few offspring at a time.
The offspring will be genetically identical to the parent.
How does internal fertilization provide a survival advantage for land-dwelling animals compared to external fertilization?
It allows the eggs to be fertilized in a moist environment.
It requires the organism to produce more eggs.
It eliminates the need for a mate.
It ensures that all offspring are genetically identical.
Which reproductive strategy is most likely found in a species that lives in a highly unstable environment where resources are unpredictable?
Producing many offspring with little parental care.
Producing one offspring and protecting it for years.
Reproducing only once every ten years.
Using only asexual reproduction in a changing climate.
The development of a placenta in mammals is a reproductive strategy that increases survival by —
A) allowing the parent to produce hundreds of offspring at once.
B) protecting the developing embryo from the external environment.
C) reducing the need for genetic variation in the population.
D) eliminating the need for specialized gametes.
Some plants produce seeds with "wings" or "parachutes" that catch the wind. How does this strategy increase the survival of the species?
It allows the plant to reproduce asexually.
It helps the seeds move to new areas with less competition.
It ensures the seeds are eaten by animals.
It makes the seeds genetically identical to the parent.
Which of the following describes a disadvantage of asexual reproduction?
It requires finding a mate.
It takes a long time for the population to grow.
The population lacks the diversity to survive a sudden disease.
It produces too many variations in the offspring.
A flowering plant attracts bees with nectar and bright colors. This reproductive strategy increases survival primarily by —
A) increasing the likelihood of cross-pollination and genetic diversity.
B) allowing the plant to survive without any water.
C) protecting the plant from being eaten by herbivores.
D) reducing the number of seeds the plant needs to produce.
A certain species of butterfly has a wing pattern that looks exactly like the eyes of a large owl. How does this adaptation most likely increase the butterfly's survival rate?
It helps the butterfly find a mate more easily.
It allows the butterfly to absorb more sunlight for energy.
It deters predators by making the butterfly look like a larger animal.
It helps the butterfly blend into the leaves of trees.
Which of the following is a behavioral adaptation?
A. A polar bear having a thick layer of fat.
B. A desert cactus having shallow, widespread roots.
C. A group of elk migrating to lower elevations during winter.
D. A poison dart frog having brightly colored skin.
In a population of beetles, some are green and some are brown. A drought turns the green grass brown. According to natural selection, what is the most likely outcome?
The green beetles will learn to eat different food.
The brown beetles will have a higher survival rate because they are camouflaged.
The population will go extinct immediately.
The green beetles will turn brown to match the environment.
Some bacteria have developed a resistance to antibiotics. Which of the following best explains how this happened through natural selection?
The bacteria decided to change their DNA to survive the medicine.
The antibiotic caused the bacteria to want to survive.
Bacteria with a natural mutation for resistance survived the antibiotic and reproduced.
The antibiotic only kills the bacteria that are too old to reproduce.
A researcher notices that a species of bird on an island has a much thicker beak than the same species on the mainland where seeds are softer. What is the most likely cause of this adaptation?
The birds on the island stretched their beaks to crack hard seeds.
Thicker beaks were a disadvantage on the island.
Birds with thicker beaks were better able to eat the hard seeds available on the island and survived to reproduce.
The island environment caused a mutation that made all birds have thick beaks instantly.
Plants in the tropical rainforest often have "drip tips" on their leaves to allow heavy rain to run off quickly. This is an example of:
A. A structural adaptation to prevent mold and leaf rot.
B. A behavioral adaptation to collect water.
C. A physiological adaptation to increase sugar production.
D. An environmental accident that has no effect on survival.
Which of the following is REQUIRED for natural selection to occur in a population?
All organisms must be genetically identical.
There must be variation within the population.
The environment must remain the same for millions of years.
Every offspring born must survive to adulthood.
A species of rabbit lives in an area that begins to experience much colder winters with heavy snow. Which trait would most likely be selected for over several generations?
Shorter ears to reduce heat loss.
Darker fur to absorb more sunlight.
Thinner fur to move faster through the snow.
A decrease in body size to require less food.
How does a favorable adaptation affect the gene pool of a population over time?
The gene for the adaptation becomes less common.
The gene for the adaptation becomes more common as survivors reproduce.
The gene pool remains exactly the same.
The gene for the adaptation disappears as it is used up.
A construction project increases the amount of sediment washing into a local stream, making the water very cloudy. Which of the following is the most likely immediate effect on the stream ecosystem?
The water temperature will decrease significantly.
Submerged aquatic plants will perform less photosynthesis.
Fish will grow faster due to the increased soil nutrients.
The amount of dissolved oxygen in the water will increase.
A prolonged drought occurs in a savanna ecosystem. How will this abiotic change most likely affect the carrying capacity of the area for zebras?
The carrying capacity will increase because there is more space.
The carrying capacity will remain the same because zebras are mobile.
The carrying capacity will decrease because there is less available food and water.
The carrying capacity will decrease because of an increase in predator populations.
Which of the following is an abiotic factor that would most likely limit the population size of plants on a forest floor?
The number of herbivores in the area.
The presence of decomposing fungi.
The amount of sunlight filtering through the canopy.
The spread of a viral plant disease.
Following a controlled forest fire, ecologists often observe a "bloom" of new plant growth. What abiotic change is primarily responsible for this?
The fire removed all predators from the area.
The fire released stored nutrients from dead organic matter back into the soil.
The fire increased the amount of oxygen in the atmosphere.
The fire cooled the temperature of the soil.
An estuary is an area where freshwater from a river meets saltwater from the ocean. If a drought reduces the flow of the river, its saltiness increases. How does this affect the organisms living there?
All organisms will grow larger to store more salt.
Freshwater-adapted species may experience dehydration and die.
The water will become clearer, allowing more sunlight to reach the bottom.
The temperature of the water will automatically decrease.
Agricultural runoff containing high levels of phosphorus enters a pond. What is the most likely sequence of events caused by this abiotic change?
Fish die → Algae disappear → Oxygen levels rise.
Algae bloom → Plants die → Oxygen levels drop → Fish die.
Water levels rise → Biodiversity increases → Sunlight increases.
Temperature drops → Bacteria die → Fish populations double.
Which process is responsible for the "fixation" of carbon from the atmosphere into an organic form?
Cellular Respiration
Photosynthesis
Decomposition
Transpiration
In an energy pyramid, which trophic level contains the greatest amount of available energy?
Tertiary consumers
Secondary consumers
Primary consumers
Producers
A student observes a food web. If the grass contains 5,000 Joules of energy, approximately how much energy would be available to the herbivores that eat the grass?
5,000 J
500 J
50 J
5 J
What happens to the 90% of energy that is NOT passed from one trophic level to the next?
It is destroyed and disappears.
It is stored in the soil for plants.
It is lost to the environment as heat.
It is recycled back to the sun.
Which of the following organisms would be responsible for removing CO2 from the atmosphere to create organic molecules?
Mushrooms (Fungi)
Rabbits (Consumers)
Cyanobacteria (Photosynthetic bacteria)
Earthworms (Decomposers)
How does the flow of energy differ from the flow of matter (like carbon) in an ecosystem?
Energy cycles, while matter flows in one direction.
Energy flows in one direction, while matter cycles.
Both energy and matter cycle through the ecosystem.
Both energy and matter flow in one direction only.
A suburban development project clears a large forest to build a shopping mall. What is the most likely immediate effect on the local ecosystem?
An increase in the biodiversity of the remaining forest area.
A decrease in the stability of the local food web due to habitat loss.
An increase in the carrying capacity for apex predators.
A decrease in the amount of carbon dioxide in the atmosphere.
The introduction of the Zebra Mussel, a non-native species, to the Great Lakes has led to a decline in native mussel populations. Why are invasive species often successful in new environments?
They have higher mutation rates than native species.
They occupy a lower trophic level than most native species.
They often lack natural predators in the new ecosystem.
They help increase the overall biodiversity of the region.
Which human activity would most likely help to mitigate (lessen) the negative effects of habitat fragmentation?
Building wildlife corridors or bridges over major highways.
Increasing the use of chemical fertilizers on nearby farms.
Introducing new predatory species to control small animal populations.
Clearing more land to create smaller, isolated parks.
Which of these would be a direct consequence of overfishing a specific species of fish in the Chesapeake Bay?
The water temperature of the bay would increase.
The population of the fish's natural prey would likely increase.
The bay would experience an increase in dissolved oxygen.
The amount of nitrogen runoff from farms would decrease.
If a new highway divides a large forest into two smaller sections, what is a long-term risk for the wildlife living there?
Increased genetic diversity due to isolation.
Decreased risk of predation for small mammals.
Reduced ability for animals to find mates and migrate.
An immediate increase in the forest's carrying capacity.
A massive volcanic eruption in Hawaii covers a large area with liquid lava. Once the lava cools and hardens into rock, which process will occur next?
Secondary succession starting with grasses.
Primary succession starting with lichens.
Secondary succession starting with shrubs.
Primary succession starting with hardwood trees.
Which of the following is the most significant difference between primary and secondary succession?
Primary succession occurs faster than secondary succession.
Secondary succession starts with bare rock, while primary starts with soil.
Primary succession starts with bare rock, while secondary starts with soil.
Secondary succession only occurs after human-made disasters.
After a major forest fire in the Blue Ridge Mountains, the ecosystem begins to recover. Why is this considered secondary succession?
Because the fire was a "second" event in that area.
Because mosses and lichens must arrive first to fix the rock.
Because the community will never reach a climax stage again.
Because the soil remained intact after the fire.
Which of these events would most likely lead to primary succession?
A controlled burn in a pine forest.
A glacier retreating and exposing a valley.
A flood depositing silt along a riverbank.
A hurricane knocking down several large trees.
In the process of succession, which type of plant would you expect to see LAST?
Small grasses and wildflowers.
Lichens and mosses.
Sun-loving shrubs.
Shade-tolerant hardwood trees (like Oak).
Which factor is most likely to "reset" a community that has already reached its climax stage?
A. A light rainstorm.
B. A catastrophic wildfire.
C. The migration of a single bird species.
D. The changing of the seasons.
