Successful bacterial resistance requires interruption of one or more of the stages essential for antimicrobial action. Which of the following is NOT a mechanism of bacterial resistance?
A) Environmental factorS
B) Clinical threshold tested (antibiotic strength used in testing
C) CAMP positivitY
D) Biological characteristics
Ans: C) CAMP positivitY
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The terms helical, icosahedral, and complex refer to
A. viral life cycles. B. forms of nucleic acid. C. types of viral envelopes. D. shapes of viruses.
Thermococcus litoralis and Thermus aquaticus are thermophilic bacteria that are
A. used as cloning vectors. B. genetically engineered bacteria. C. sources of heat-stable DNA polymerases. D. principal sources of restriction endonucleases.
Endothermic animals
a. use up more energy than ectotherms. b. are more active at a wider range of temperatures than ectotherms. c. have a higher metabolic rate than ectotherms. d. may have feathers to reduce heat loss. e. fit all of these descriptions
You have been assigned to conduct a scientific study on the effects of four types of fertilizer on broccoli growth. You visit several broccoli farms to make observations and use these observations to find preliminary correlations and form hypotheses. To test your hypotheses, you set up five plots of broccoli-one plot for each fertilizer type plus a control plot, which is not fertilized. When you meet with your professor to discuss your progress, he tells you that your project is missing an important component of the scientific method. What is missing?
A. Testing the fertilizer in a natural setting on wild relatives of broccoli B. Setting up plots that receive more than one type of fertilizer C. Testing biotic factors such as herbivore abundance D. Using more than one plant species so your conclusions can be more broadly applied E. Replicating each fertilizer treatment in multiple plots