Which of the following sets of characteristics describes the highest level of threat potential from biological weapons?
A. a waterborne toxin that is easily introduced into public water supplies and does not replicate in humans
B. a pathogen of livestock transmitted by contact with infected animals but not infected people
C. a human pathogen easily produced as an aerosol and transmissible by respiratory aerosols
D. a pathogen of wheat that could be delivered using crop dusters
E. a microbe that can be introduced into food during packaging and withstands refrigerator temperatures but not typical cooking temperatures
Answer: C
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Which of the following flaviviruses can be prevented by vaccination?
A) yellow fever B) dengue fever C) hantavirus D) Ebola
The end result of the process in Figure 20-1 is:
a. sympatric speciation.
b. allopolyploidy.
c. hybridization.
d. rapid speciation.
e. All responses apply
If true-breeding red long radishes are crossed with true breeding white oval radishes, the F 1 will be expected to be which of the following?
A) Red and long B) Red and oval C) White and long D) Purple and long E) Purple and oval
Transferring Euglena into a dark environment results in the loss of photosynthetic pigment. What conclusion does this support?
A. Euglenoids are neither plant-like or animal-like protists. B. Euglenoids are closely related to plants. C. Euglenoids are obligate photoautotrophs. D. Light triggers heterotrophy.