Generally speaking, nutritionally variant streptococci require what ingredient not found in most conventional media?
a. Vitamin B6
b. Nalidixic acid and its components
c. Nicotinamide adenine dinucleotide (NAD) enrichment
d. Blood or blood products
A
Abiotrophia and Granulicatella will not grow on blood or chocolate agar unless pyridoxal (vita-min B6) is supplied by the placement of a pyridoxal disk, by cross streaking with Staphylococcus, or by inoculation of vitamin B6–supplemented culture media.
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Bulk flow of organic compounds is indicated by letter ____
a. A b. B c. C d. D e. E
In a pedigree chart, a male showing the specific trait being studied is indicated by a
a. darkened square. b. clear square. c. darkened diamond. d. clear triangle. e. darkened circle.
Some animals are facing extinction as a direct result of deliberate efforts to exterminate them because of their
perceived harm to economically useful species. Examples of these include:a. cheetahs and rhinos. b. passenger pigeons and cheetahs. c. prairie dogs and rhinos. d. rhinos and macaws. e. mountain lions and wolves.
A 5-year-old boy has bloody diarrhea for 2 days, nausea, abdominal cramps, and vomiting. He subsequently undergoes acute renal failure. Upon questioning the mother, it is learned that the diarrhea started 24 hours after the child had eaten a hamburger at a fast-food restaurant. Which of the following is the likely cause of this disease?
A. Bacillus cereus B. Vibrio cholerae C. Escherichia coli strain O157:H7 D. Staphylococcus aureus E. Salmonella typhi