Antimicrobial susceptibility testing should be performed when
a. a single bacterial species grows from any body site.
b. an isolate has a predictable susceptibility profile to therapeutic drugs of choice.
c. reliable standardized methods for testing a clinically significant isolate exist.
d. administering intravenous or oral antibio-tics to treat an infection.
C
AST should be done on clinically significant isolates only. The decision as to what defines clini-cal significant may require consultation between microbiology staff, medical director, supervisor, infectious disease specialist, and attending physician in charge of the patient's care. Also, for isolates that are significant but there are not standardized methods for testing, either information from the literature should be used to guide treatment or testing can be done with a disclaimer that results must be viewed with caution.
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What do Riftia worms lack that makes them different than other worms?
a. A circulatory system b. An excretory system c. A digestive system d. A nervous system
Germ-line mutations
A. can be passed to subsequent generations. B. occur in sex cells. C. may range from having no effect to completely inactivating protein activity. D. All of the answer choices are true about germ-line mutations. E. Only two of the answer choices are true.
Photosystem I and photosystem II are, respectively, part of
A. the carbon reactions only. B. the carbon reaction and the light reactions. C. respiration. D. the light reactions and the carbon reactions. E. the light reactions only.
Primary growth involves:a
an increase in length. b. an increase in girth. c. a production of secondary xylem. d. a production of cork cells. e. a division of vascular cambium cells.