The most common etiologic agent in uncomplicated community-acquired urinary tract infection is:

a. Escherichia coli.
b. Klebsiella spp.
c. Staphylococcus saprophyticus.
d. Streptococcus pyogenes.


A
E. coli is the most frequently isolated agent of uncomplicated community-acquired urinary tract infections.

Biology & Microbiology

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A) removal of a double-stranded fragment of damaged DNA. B) nicking the backbone of one DNA strand. C) recognizing and excising the incorrect base from a nucleotide. D) removing extraneous groups such as methyl or oxygen added by mutagens. E) replacing an A-T base pair with a C-G base pair.

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In a conjugation experiment, the Hfr donor is thr+, leu+, his+, str. The recipient is thr–, leu–, his–, strS. Why would you use medium containing streptomycin to analyze your results?

What will be an ideal response?

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Which agent of evolutionary change occurs when a population's allele frequency is altered due to chance?

A. genetic drift B. gene flow C. nonrandom mating D. natural selection

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Dark chocolate and tomatoes contain antioxidants that have been unequivocally shown to improve health.

a. true b. false

Biology & Microbiology