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.
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The first step in base excision repair is
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.
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?
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
Dark chocolate and tomatoes contain antioxidants that have been unequivocally shown to improve health.
a. true b. false