Which of the following is a technique for rapidly replicating copies of regions of DNA?
a. cloning
b. polymerase chain reaction (PCR)
c. gel electrophoresis
d. recombinant DNA
b. polymerase chain reaction (PCR)
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Which of the following would be the best strategy to prevent the spread of yellow fever and dengue fever into the southern United States?
A) mosquito avoidance and eradication B) vaccination C) monitoring bird populations D) tick avoidance
Whisk ferns, club mosses, and horsetails have all the following characteristics in common with ferns except
A. all of these plants are seedless tracheophyte plants. B. all of these plants produce flagellated sperm. C. all of these plants form antheridia and archegonia. D. all of these plants require free water for the process of fertilization to occur. E. all of these plants have no vascular tissue.
A(n) threatened species is a species in imminent danger of extinction. Indicate whether the statement is true or false
Which of the following components is NOT involved in the phosphorus cycle?
A) Some rocks and soil B) The atmosphere C) Consumers D) Decomposers E) Producers