Label the diagram by dragging the appropriate labels into the correct positions.
Mmuae Afoforo a Wobɛpaw:
Nucleus
Cytoskeleton
Flagellum
Cell Wall
Golgi
Mitochondrion
Chloroplast
Rough E.R.
Scientists recently developed a technique for synthesizing proteins outside of cells. These cell-free systems are used to produce pure proteins that can be used in many ways. One use is the manufacturing of medicine.
Use the drop-down menus to construct an ethical question that should be consdiered before using cell-free systems to manufacture medicine:
"Do cell-free systems the cost of producing some medicines so that more the medicine?"
Label the diagram by dragging the appropriate labels into the correct positions.
Scientists studied a species of phytoplankton. These phytoplankton are an important part of marine food webs and are major primary producers. As all organisms are regulated by their environment, so are the phytoplankton. The scientists looked at the relationship between the populaton of the phytoplankton and viruses found in the same environment. They created three environments in a laboratory setting to collect data on the numbers of phytopankton and viruses over a period of time and graphed the results once they were averaged, as shown on this chart.
The scientists claimed that the growth and stability of the phytoplankton populations were affected by the viruses. Using the information given, which TWO arguments support this claim? (Select TWO choices.)
A genome is the complete set of genetic material present in a species. Genome analysis usually includes the study of both the structure and the function of genes. Analysis of the structure involves determining the sequence of all genes in the chromosomes of individuals, and analysis of the function involves determining how the genes are expressed in an individual.
Use the drop-down menus to explain how the two areas of genome analysis help researchers determine the sequence and patterns of expression of the genes in a species' genome:
"Analysis of genome structure and function helps researchers understand how the products of genes, , interact during the of individuals of the species."
Researchers recently compiled data about 2,300 mammal species and 6,700 bird species and determined that the number of species found at tropic latitudes is greater than the numbers found at temperate and polar latitudes.
Select the THREE statements from the list below that BEST explain why biodiversity is greatest in the tropics. (Choose THREE statements.)
Ruby-throated hummingbirds are found throughout eastern North America. They are omnivores, feeding on nectar, pollen, tree sap, insects, and spiders. They get all the water they need from nectar. Most nests are in forested areas, citrus groves, marshes, and scrubland. The hummingbirds breed in the spring and the summer, and females raise one to three broods per breeding season. Most of the hummingbirds migrate to Mexico or Central America for the winter. Many fly nonstop for 20 hours to cross the Gulf of Mexico. However, increasing numbers of the hummingbirds have begun to winter north of the gulf. Researchers have documented that the hummingbirds’ winter range has expanded northward by about 300 kilometers in recent years.
Which explanation BEST predicts the ability of the hummingbirds to survive their first winter in this new environment?
The diagram shows an incomplete pedigree for the inheritance of an autosomal dominant trait (G). With autosomal dominant traits, only one copy of the gene is needed for the trait to be inherited and expressed by offspring.
Move the shapes to complete the pedigree based the inheritance patterns for an autosomal dominant trait. (Each option will only be used once.)
This Punnett square shows the inheritance of flower color in snapdragon flowers.
Use the drop-down menus to explain the inheritance of flower color in snapdragons:
"The alleles for flower color show because both alleles are in individuals."
Today, the common type of banana we buy and eat is a Cavendish banana. They arose from chance mutants that were produced sexually from wild banana plants. The Cavendish banana is infertile and can only be produced by cloning from root shoots. Large commercial growers worldwide now plant only the mutant type. Some information about both types of banana is recorded in the table.
Why are scientists warning that exclusively growing this mutant type by asexual reproduction presents
a serious disadvantage?
Supports Claim 1 | Supports Claim 2 | Does not support either claim | |
|---|---|---|---|
Deletions during replication are passed to daughter cells. | |||
Daughter cells have too much or too little genetic material. | |||
Daughter cells are all haploid but are not genetically identical. | |||
Homologous chromosomes exchange genetic material during meiosis. | |||
Heritable mutations caused by environmental factors result in the loss of entire chromosomes. | |||
Homologous chromosomes separate incorrectly, producing daughter cells with unequal amounts of genetic material. |
A student is performing an investigation using two solutions. The solution in the dialysis bag has a lower solute concentration in moles per liter (M) than the solution in the beaker.
Move a solution description into the boxes under dialysis bag and the beaker to describe each solution. Then, move an arrow into the direction box to identify which direction the water will move based on the concentrations of the solutes. (Not all options will be used.)
A group of researchers gathered data from 40 forest sites and determined that forests with many different species of trees are less affected by drought (long periods of dry conditions) than forests with few or only one tree species. Since different species of trees have traits that cause them to use and move water in different ways, they are not equally impacted by dry conditions.
From the six tree traits listed below, select only the THREE traits that would MOST LIKELY increase the ability of a tree species to survive during a drought. (Select THREE traits.)
Geographic isolation caused the separation of rainforest frog populations into a population in the north and a population in the south. The separated populations later reconnected because the climate became wetter and warmer, causing the rainforest to expand. When males from the north mated with females from the south, the offspring failed to develop past the tadpole stage. When males from the south mated with females from the north, the offspring developed more slowly than the offspring of pairs of northern frogs. Based on these data, which event occurred while the two populations of frogs were separated?
A long-term study off the coast of Japan found that sea urchin populations are affected by harmful algal blooms known as red tides. Sea urchins are shallow-water herbivores that play an important role in the structure of coastal marine communities. Red tides discolor the water, deplete oxygen levels in the water, and release harmful toxins into the water and air. Four main components are necessary for an algal population to bloom:
1. The presence of certain algae species
2. A major nutrient source
3. Wind and water currents that move the algae close together
4. Increasing water temperatures
Some human activities can have a direct effect on the four components that increase the number of algal blooms. Other human activities can have an indirect effect that can be observed over long periods of time.
From the list of components, select the TWO that are directly affected by human activities. (Select TWO choices.)
A student is investigating genetic variation in chromosomes. The diagram shows two ways that meiosis can result in genetic variation.
The student makes two claims:
Claim 1: Genetic variation in Example 1 is a result of nondisjunction.
Claim 2: Genetic variation in Example 2 is a result of crossing over.
Six pieces of evidence are listed below. For each one, decide whether it is evidence that supports Claim 1, evidence that supports Claim 2, or evidence that does not support either claim.
