If there is variation in a given character within a population, selection may be unable to act on that character if:
a. the genes involved have effects on other characters that are also under selection.
b. there is gene flow into that population.
c. the population is peripheral to a larger population that faces different selective conditions.
d. All of the above.
e. None of the above.
D
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Which gymnosperm bears large cones and is often mistaken for a palm?
a. cycad b. conifer c. gnetophyte d. gingkophyte
The main storehouse for substances in sedimentary cycles is ____
a. oceans b. air c. Earth’s crust d. fresh water e. sand
The following list describes ways that CRISPR may be used to treat cancer. Which of the following describes immunotherapy instead of CRISPR therapy?
A. Cancer causing mutations within cells may be corrected, preventing cancer from occurring. B. Cytotoxic T cells may be stimulated, creating an immune response against cancer cells and shrinking tumors. C. Mutated tumor-suppressor genes may have their previous function restored, allowing normal regulation of cell division. D. Nucleotides within DNA may be removed, inactivating genes that are responsible for some types of cancer. E. Mutated proto-oncogenes may have their previous function restored, allowing normal regulation of cell division.
Disinfection of beverages, such as apple juice, milk, and wine, is optimally achieved by
A. moist heat autoclave. B. chlorination. C. filtration. D. boiling water. E. pasteurization.