Which of the following statements about mycoplasmal pneumonia is TRUE?
A) The causative agent is a virus.
B) The symptoms resemble pneumococcal pneumonia.
C) The causative agent cannot be cultured.
D) Treatment is tetracyclines.
E) Annual vaccination can prevent infection.
D
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Persons infected with HIV often die of opportunistic diseases because
A. HIV can transduce other viruses into virulent strains. B. HIV destroys T cells. C. HIV binds to antibodies. D. HIV is a retrovirus. E. HIV mutates easily.
Which of the following represents a double-blind study?
A) The test group knows whether they are receiving a placebo or the actual treatment, and so do the researchers. B) The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do. C) The test group knows whether they are receiving a placebo or the actual treatment, but the researchers do not know until all the data are collected. D) Neither the test group nor the researchers know whether the test group is receiving a placebo or the actual treatment until all the data are collected.
The most common and physiologically important auxin is:
a. indoleacetic acid. b. indolebutyric acid. c. naphthaleneacetic acid. d. 2,4-D. e. 2,4,5-T.
Alternation of generations in plants refers to the alternation of:
a. meiotic and mitotic stages. b. diploid and haploid stages. c. male and female stages. d. spore and seed stages. e. thallus and leaf stages