Of the following, which is the MOST common AIDS-associated opportunistic disease?
A) Pneumocystis carinii pneumonia
B) cryptosporidiosis
C) histoplasmosis
D) cryptococcosis
Answer: A
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Introduced species become invasive when they
A. compete with native species without expanding their range. B. move from temperate to tropical settings. C. expand their range and outcompete native species. D. lead to a cost for humans. E. fill an empty ecological niche.
Which of the following best describes the nature of the cells of mature, functioning xylem?
A) dead, thick-walled tubes B) living cells that have lost their nucleus C) dead cells that retain some organelles and some maintenance functions D) living, thick-walled tubes
In the part of an embryo sac farthest away from the micropyle you should find
a. the central cell. b. a seed. c. the pollen tube. d. synergids. e. antipodal cells.
Thermoreceptors in the brainstem detect internal changes in temperature
____________________ Indicate whether the statement is true or false.