A population of T cells has been stimulated to proliferate in response to a particular antigen. A sample of 1000 cells is examined microscopically, revealing that 200 of these cells are in the various stages of mitosis. Of the remaining 800 in interphase, 400 have x amount of DNA, 250 have 2x, and the remaining 150 have amounts somewhere between x and 2x. Additional analysis reveals that the G2
phase of the cell cycle lasts 2 hours. What is the total length of the cell cycle?
A) 2.5 hours
B) 4 hours
C) 6.4 hours
D) 8 hours
E) 13.3 hours
D) 8 hours
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Moist heat sterilization at 100°C kills all of the following EXCEPT
A. bacterial endospores and fungal spores. B. viruses. C. bacterial endospores. D. fungal spores.
Chemoreceptors respond primarily to changes in PCO2 indirectly by its effect on
A) hydrogen ion concentration. B) hemoglobin concentration. C) 2,3-diphosphoglycerate (2,3-DPG) concentration. D) lactic acid concentration. E)PO2.
Bacterial food poisoning resulting from Clostridium (botulinum/difficile/perfringens) contamination is characterized by watery diarrhea accompanied by intestinal cramping but not fever, and it resolves in about a day
What will be an ideal response?
A bacterial culture that grows only near the surface of a thioglycolate broth is an example of what type of organism?
A. Obligate aerobes B. Aerotolerant anaerobe C. Facultative anaerobes D. Obligate anaerobes