In logistic growth, the point at which population growth ceases is referred to as the
A) threshold of security.
B) Malthusian parameter.
C) saturation point.
D) carrying capacity.
D
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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.
A benefit of alternate splicing of introns out of mRNAs is that
A) it maximizes the number of introns. B) it increases the number of proteins that the genome encodes. C) it lowers the risk of infection. D) it speeds transcription.
When might imperfect multicollinearity not require the collecting of more data to remedy the likely imprecise estimates of the affected variables?
A. When the treatment effect is positive B. When the imperfect multicollinearity is confined to control variables only C. When the model suffers from heteroscedasticity as well D. When you are only conducting hypothesis tests
Energy enters most ecosystems by the process of
A. fermentation. B. biosynthesis. C. photosynthesis. D. biogeochemical weathering. E. respiration.