In the "kitchen-sink model" for CD4 T-cell loss, what does the sink's drain represent?
A. the amplification of the virus in the blood
B. the wide variety of possible opportunistic infections
C. the destruction of the virus by the immune system
D. the production of new CD4 T cells
E. the destruction of CD4 T cells by the virus
Answer: E
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A 36-year-old emergency medical technician (EMT) is exposed to a patient with brucellosis. Blood cultures are drawn from the EMT and reported as negative after 1 week. Which of the following statements explains this discrepancy?
a. The blood culture system is most likely not correctly functioning. b. Brucella does not grow in the blood. c. The blood culture bottles are most likely expired. d. The blood should have been incubated for a minimum of 3 weeks.
In addition to their characteristic cilia, most ciliates contain two types of
A. nuclei. B. chloroplasts. C. flagella. D. wood-digesting enzymes. E. cysts.
What is it called when a demand for a new lifestyle leads to many speciation events from one founder species?
a. sympatric speciation b. allopatric speciation c. adaptive radiation d. convergent radiation
In fruit flies, which of the characteristics you studied was X-linked? ____________________
Fill in the blank(s) with the appropriate word(s).