Why aren't ferns commonly found in deserts?
A. Fern spores are unable to resist prolonged dry conditions.
B. Fern fronds are sensitive to UV light.
C. Fern pollen is spread by insects that do not occur in deserts.
D. Ferns are nonvascular and cannot absorb water from deep within the soil.
Answer: A
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Of the following, which has benefited at the expense of all of the others in the global shift toward open markets and free trade through neoliberal policies propagated by core countries?
A) corporate businesses B) the environment C) public investment in transportation and public utility infrastructure D) the power and influence of labor unions E) role of central and local governments as mediators and regulators
Herceptin® is a drug that is given to treat certain breast cancers. However, it is most effective on tumors that are overexpressing the gene HER2. Which of the following strategies would be best for determining whether Herceptin® would be effective in a given patient?
A) Sequence DNA from the patient's sperm or eggs to determine whether the patient's germ cells contain gain-of-function mutations in HER2, and treat with Herceptin® only if they do. B) Determine the patient's HER2 sequence and compare it to a database of known HER2 mutations to determine whether the overexpression allele is present; if the overexpression allele is present, give Herceptin®. C) Determine the patient's HER2 sequence and compare it to a database of known HER2 mutations to confirm that the patient has a mutation in the gene; give Herceptin® if any mutation is found. D) Perform microarray analysis to determine the location of the patient's HER2 gene and give Herceptin® if the HER2 gene is not in the normal location.
When a cell is in a solution where the concentration of solute is the same in the cell as in the solution, the solution is called ________.
a. isotonic b. hypertonic c. hypotonic d. saturated
Salt marsh communities predominate in temperate and subarctic areas
Indicate whether the statement is true or false