What type of plants are usually seedless?
A. Aneuploid
B. Diploid
C. Triploid
D. Tetraploid
C
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Ecstasy Dr. Goddard is studying the behavioral effects of MDMA (Ecstasy) using a rat model. Dr. Goddard observes a change in rat behavior that he likens to ____.
When killifish were present, what was the main selection factor affecting the average number of spots on male guppies?
a. reduction in spot number to avoid predation b. increase in spot number to attract females c. both selective forces were in effect when killifish were present
Which one of the following experiments would be considered acceptable in our society?
A) Determining the effects of cocaine use on babies born to cocaine-using mothers. B) Determining the response of a patient's "incurable" cancer to a newly developed cancer drug. C) Testing the effects of radiation exposure on volunteers. D) Testing the effectiveness of a new AIDS vaccine using deliberate exposure of human volunteers to HIV. E) Testing the effectiveness of a newly developed antibiotic using deliberate exposure of humans to antibiotic-resistant bacteria.
What cell structure does Neisseria gonorrhoeae use to attach and enter host epithelial cells?
A) fimbriae B) flagella C) M proteins D) capsules E) cell wall waxes