Which of the following is true about the North American diet?
a. Most of our protein comes from plant sources.
b. Approximately half of our carbohydrates come from simple sugars.
c. Most of our fats come from plant sources.
d. Most of our carbohydrates come from fibers.
b. Approximately half of our carbohydrates come from simple sugars.
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Once they have been processed through the citric acid cycle, the acetyl-CoA molecules from a single glucose molecule will produce:
A. 2 ATP, 6 NADH, 4 CO2. B. 6 NADH, 6 GTP. C. 6 FADH2, 2 ATP, 6 CO2. D. 6 GTP, 6 FADH2. E. 4 CO2, 6 FADH2, 2 ATP.
A new archeological dig in North America reveals bones of a Homo sapiens female from 10,000 years ago. It would be reasonable to predict the genetic analysis would reveal:
A. evidence of interbreeding with Neanderthal. B. that the haplotype would be identical to bones of equal age found in South America. C. that the haplotype might be found in African populations. D. that the haplotype would not be found in African populations. E. It is impossible to make any predictions regarding these remains.
Klebsiella spp. were isolated from a sputum sample, and susceptibility testing was performed. The isolates were sensitive to several antibiotics; however, they were resistant to ampicillin. Which one of the following statements explains this discrepancy?
a. The ampicillin disk is most likely expired. b. Because Klebsiella spp. should be sensi-tive to ampicillin, a technical error is to blame. c. Ampicillin inhibits cell wall synthesis. In addition, because Klebsiella spp. do not have a cell wall, they should not have been tested for ampicillin. d. No discrepancy is present; Klebsiella spp. are normally resistant to ampicillin.
Prereduced, anaerobically sterilized (PRAS) media:
a. are produced, packaged, shipped, and stored under anaerobic conditions. b. have a short shelf life of only 2 weeks. c. enable the culture to be incubated in the regular incubator under aerobic conditions. d. contain peroxides that enhance the growth of certain anaerobes.