Which of the following statements is FALSE?
a. Ecologists use models to represent relationships between biogeochemical cycles and most
ecosystems.
b. The physical environment has virtually no reservoir for most elements.
c. Inputs from the physical environment and recycling made possible by decomposers and
detritivores maintain the nutrient reserves in an ecosystem.
d. In most major ecosystems, the amount of nutrients that is cycled within the ecosystem is
greater than the amount entering or leaving the ecosystem in a given year.
e. Once elements are in the biological compartments of the biogeochemical cycles, they are
unlikely to leave until the organism dies.
B
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In which of the following ways are Chlamydia and viruses the same?
A. Both are best treated with antiviral chemotherapy. B. Both can remain dormant in the cell nucleus for long periods of time. C. Both are able to reproduce only within a eukaryotic cell. D. Both have surface proteins that cannot be recognized by the immune system.
A mosquito becomes infected with West Nile virus and then it bites a human and transfers West Nile virus into the human's bloodstream. Which organism(s) is the vector in this case?
a. human b. mosquito c. bird d. mosquito and bird e. mosquito and human
What is the role of actin in eukaryotic cells?
A. It forms the centromere that holds sister chromatids together. B. It forms the spindle that pulls chromosomes apart. C. It is necessary for the DNA to replicate. D. It provides strength in stretching and compression of a cell. E. It forms the structures inside flagella that allow the bending motion for cell motion (swimming).
Listeria monocytogenes is a human pathogen, growing readily in the human body. It poses a problem in food storage because of its ability to grow in refrigerated foods, such as unpasteurized milk or deli meats. An organism that prefers moderate temperatures, such as 25 - 40C but is capable of growth at refrigerator temperatures is known as a:
mesophile psychrophile psychrotropha thermophile mesotroph