Cigarette smoking causes cancer due to the
A) effects they have on our breathing mechanisms.
B) chemical compounds in the smoke.
C) fact that the chemical compounds are resistant to human immune systems.
D) immunosuppressive effects they display.
Answer: B
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B cells:a
are produced in the adult spleen. b. lyse bacterial cell walls by secreting digestive enzymes. c. can become plasma cells, which produce interleukins. d. undergo clonal reproduction once activated. e. stimulate apoptosis.
Hosts who do not display disease symptoms but who nevertheless are infected and can spread infection are referred to as __________.
Fill in the blank(s) with the appropriate word(s).
Which disease has an allergic cause?
Select one: a. otitis media b. laryngitis c. asthma d. pneumonia e. emphysema
Triclosan, a common ingredient in antimicrobial hand soaps available to consumers, has recently been banned by the FDA (Food and Drug Administration). All of the following are concerns regarding the use of triclosan, except
A. Wide spread regular use of triclosan could interfere with the maintenance of healthy normal microbiota. B. These are all concerns that have been expressed about triclosan use. There are no exceptions here. C. There are concerns that triclosan may be a hormone disruptor. D. Wide spread use of triclosan may favor the survival and growth and of highly resistant bacteria. E. Scientific evidence does not demonstrate that triclosan-supplemented soaps are any more effective than plain soap and water for hand hygiene.