Sphincters
a. are muscles in longitudinal arrangement.
b. prevent movement of material through the digestive tract.
c. are smooth muscles.
d. are only found at the beginning of the stomach.
e. can contract but not relax.
C
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Decontamination strategies used for potable water and the control of E. meningoseptica are similar to those utilized for which organism?
a. Streptococcus pneumoniae b. Staphylococcus aureus c. Listeria monocytogenes d. Legionella spp.
The common characteristic of Alveolata is
A. a single, unique mitochondria. B. a layer of flattened vesicles beneath the plasma membrane. C. silica covering. D. funnel-shaped, contractile collar. E. presence of a plasmodium.
Pea plants are self-pollinators. What can you further deduce about peas? (Check all that apply.)
A. Peas will be more resistant to new plant diseases. B. Peas will be more resistant to garden pests than other plants. C. To perform his pea cross-pollination experiments, Gregor Mendel must have first removed the stamens from flowers to prevent self-pollination. D. Peas are less likely to invade highly variable natural environments than other plants. E. A gardener planning to collect heirloom seeds can plant different varieties of peas near each other.
The disease known as dengue hemorrhagic fever is actually
A) a hyperimmune response to reinfection with the dengue virus. B) an immediate immune reaction to the initial infection with the dengue virus. C) an antibody-antigen complex reaction. D) the result of co-infection with other arboviruses. E) the chronic carrier state of the dengue virus.