Filopods harboring ________ are especially dangerous because the pathogens move about host tissues, even infecting the central nervous system, without being exposed to the immune system
a. Campylobacter jejuni
b. Listeria monocytogenes
c. Norwalk virus
d. Yersinia enterocolitica
Answer: B
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Recall that over the last 400,000 years, atmospheric CO2 levels have fluctuated, with the lowest levels occurring during glacial periods and the highest levels seen during interglacial periods
Why might atmospheric CO2 levels be lower during glacial periods? A. During glacial periods there are more volcanic eruptions. B. During glacial periods there are fewer photosynthesizing plants. C. During glacial periods more carbon is stored in ocean reservoirs. D. During glacial periods chemical weathering stops.
Which of these characteristics first developed in reptiles?
Select one: a. amniotic egg b. scales on skin c. four-legged body d. skull and vertebral column e. animals with lungs
Which of the following is not a characteristic of infectious mononucleosis?
A. Active EBV can be passed in saliva. B. Symptoms include fever, sore throat, and swollen lymph glands. C. The virus remains within a person's body for the rest of his or her life. D. There is uncontrolled white blood cell proliferation. E. It is caused by an Epstein-Barr virus.
Identical population splitting events occurred simultaneously on two neighboring islands, B and C, producing subpopulations B1 and B2, and C1 and C2. We do the same sampling scheme to analyze B1 and B2, and C1 and C2
We find that B1 and B2 are reproductively isolated from each other after 50,000 years, and that C1 and C2 are still interfertile after 100,000 years. Why does reproductive isolation arrive at different rates on these three islands? What will be an ideal response?