MTM, Martin-Lewis (ML), and New York City (NYC) media were all developed for the selective isolation of which organism?
a. M. catarrhalis
b. Chlamydia trachomatis
c. N. gonorrhoeae
d. N. mucosa
C
Because gonococci must often be isolated from sites that contain large numbers of normal flora (e.g., genital tract, upper respiratory tract), selective media have been developed to facilitate their recovery. The first of these was the Thayer-Martin medium, a chocolate agar with an enrichment supplement (IsoVitaleX) and the antimicrobials colistin (to inhibit gram-negative bacilli), nystatin (to inhibit yeast), and vancomycin (to inhibit gram-positive bacteria). This original medium was subsequently modified to include trimethoprim (to inhibit swarming Proteus), and its name was changed to MTM medium. ML medium is similar to MTM except that anisomycin, an antifungal agent, is substituted for nystatin, and the concentration of vancomycin is increased. A transparent medium containing lysed horse blood, horse plasma, yeast dialysate, and the same antibiotics as MTM, called NYC medium, has also been used.
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DNA double helices are soluble in water but insoluble in alcohol. How do these physical properties reflect the chemical structure of the DNA molecule?
A) The charged phosphate groups and sugars of DNA are hydrophilic. B) The purine and pyrimidine bases are hydrophilic. C) The 5 prime to 3 prime polarity of DNA makes it soluble in water but not in alcohol. D) The charged R-groups of DNA are hydrophilic.
The first genome sequenced was that of a
A) virus. B) bacterium. C) eukaryote. D) archaeon.
Which genotype would have an advantage if a recessive allele coded for a slightly different, functional protein?
Endosperm tissue arises by the fusion of a sperm nucleus with two nuclei of the
A. female egg. B. female gametophyte central cell. C. male gametophyte. D. ovule wall. E. female style.