The selective medium, thiosulfate citrate bile salts sucrose (TCBS) agar, is especially formulated for isolating what pathogen from stool cultures?
a. Vibrio
b. Salmonella
c. Shigella
d. Plesiomonas
A
Fecal samples for the cultivation of Vibrio spp. are plated on the TCBS agar. Although some Vi-brio spp. grow very poorly on this medium, those that grow well produce either yellow or green colonies, depending on whether they are able to ferment sucrose and therefore produce yellow colonies.
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The use of the multiplication rule requires which of the following?
A. The events being considered are associated. B. The events being considered occur independently.
The evolution of new species
A. always takes millions of years. B. can take place in one generation. C. is a rare event over hundreds of millions of years. D. is not occurring today.
The golden age of antibiotics began in 1928 with Sir Alexander Fleming's discovery of an antibacterial compound he called what?
A) Arsenic B) Salvarsan C) Sulfonamide D) Penicillin E) Tetracycline
Which situation involves a risk to a fetus due to the mother smoking during pregnancy?
A. decreased digestive activity in the stomach of the fetus B. a decrease in the amount of oxygen in the ovary of the mother C. inhalation of secondhand smoke by the fetus D. toxins in the bloodstream of the mother