Klebsiella spp. were isolated from a sputum sample, and susceptibility testing was performed. The isolates were sensitive to several antibiotics; however, they were resistant to ampicillin. Which one of the following statements explains this discrepancy?
a. The ampicillin disk is most likely expired.
b. Because Klebsiella spp. should be sensi-tive to ampicillin, a technical error is to blame.
c. Ampicillin inhibits cell wall synthesis. In addition, because Klebsiella spp. do not have a cell wall, they should not have been tested for ampicillin.
d. No discrepancy is present; Klebsiella spp. are normally resistant to ampicillin.
D
Klebsiella spp. are normally resistant because of intrinsic resistance.
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The pH of the inner thylakoid space has been measured, as have the pH of the stroma and of the cytosol of a particular plant cell. Which, if any, relationship would you expect to find?
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There is significantly more genetic variation between human populations than within them
a. True b. False Indicate whether the statement is true or false
Various techniques have been developed to isolate strains of bacteria carrying a particular mutation. One of them is, bacteria containing wild-type cells and cells of a desired mutant are grown on a medium lacking the nutrient for which the desired mutants are auxotrophic but containing an antibiotic that only kills growing cells. In this environment,
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Eosinophils respond to (complement/lipopolysaccharide/histamines) and kill bacteria in a nonphagocytic process
What will be an ideal response?