Based on the graph above, after approximately what period of time could another impulse be propagated?
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A) 1 msec
B) 2 msec
C) 3 msec
D) 4 msec
E) immediately following the first stimulation
C) 3 msec
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Plants in the desert-adapted families Cactacea (cactus) and Euphorbia (euphorbs) share many of the same physical characteristics, such as succulent stems that store water and CAM photosynthesis, but they do not share a recent common ancestor. This evidence suggests that these families are an example of
A. convergent evolution. B. homologous structures. C. vestigial structures. D. divergent evolution.
In the experiments by Arnold, et al., why were some leaves on a cacao plant treated with endophytes and others were not?
A. to control the amount of Phytophthora that spread to other plants B. to provide a control for comparison of treated and untreated C. to reduce the amount of endophyte spores that were needed D. endophytes spread from one leaf to another E. to reduce the number of plants that were needed
Spreading black necrosis, swelling, pain and froth or bubbles are characteristic of
A) anthrax. B) gas gangrene. C) necrotizing fasciitis. D) chromoblastomycosis. E) Pseudomonas infection.
Nearly everyone appears to be infected with polyomaviruses BK and JC by the age of 15.
Answer the following statement true (T) or false (F)