Necrotizing fasciitis is
A. not treatable with antimicrobial drugs.
B. typically a sequelae of streptococcal pharyngitis.
C. possibly caused by antibodies to Group A streptococci that cross-react with body tissues.
D. associated with strains of Streptococcus pyogenes producing destructive enzymes and toxins.
E. also called impetigo.
Answer: D
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Individuals that have 2 alleles for most gene loci are best described as
A. haploid. B. diploid. C. dihybrid. D. homozygous. E. heterozygous.
A sputum culture from a cystic fibrosis patient grew Stenotrophomonas maltophila. A broth microdilution panel was inoculated. Antimicrobials tested included: ceftazidime, imipenem, ti-carcillin-clavulanate, levofloxacin, and trimethoprim-sulfamethoxazole. After 20-hour incubation at 35°C in ambient air, no growth was seen in any well of the microtiter plate. Which of the following statements is
true? a. The isolate is susceptible to all antimicro-bials tested. b. The microdilution plate was incubated under incorrect conditions. c. The test results are invalid and retesting would be recommended. d. A Cefinase test for lactamase activity should be done as an adjunct to MIC re-sults.
The original source of all genetic variation is _____.
A) mutation B) meiosis C) a need for new traits D) natural selection E) recombination
During sexual reproduction, Saccharomyces cerevisiae produces blastospores.
Answer the following statement true (T) or false (F)