You begin an experiment involving metabolic processes in human liver cells, but you discover your liver tissue samples have been contaminated with a strain of obligate anaerobic bacteria. Theoretically, how could you kill the bacteria while minimizing damage to the liver cells?
a. soak the tissue samples in pure ethanol
b. put the sample through an autoclave
c. expose the samples to gaseous oxygen
d. dehydrate the tissue samples overnight
c. expose the samples to gaseous oxygen
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Acute viral gastroenteritis can be caused by the
A. varicella zoster virus and rubeola virus. B. the Delta agent. C. cytomegalovirus and hepatitis E. D. norovirus and the rotavirus group.
A researcher wants to determine if a unicellular organism he discovered is an autotroph or a heterotroph
He radioactively labels the carbon in CO2 and C6H12O6, and exposes one culture of his organism to the labeled CO2 and another culture to the labeled C6H12O6. What would happen if his organism is an autotroph? A. Labeled carbon would be seen in the carbohydrates of CO2-exposed organisms. B. Labeled carbon would be seen in the carbohydrates of C6H12O6-exposed organisms. C. Labeled carbon would not be seen in the carbohydrates of either culture. D. Labeled carbon would be seen in carbohydrates of both cultures.
The cells within a morula are referred to as ____
a. stem cells b. endoderm c. ectoderm d. blastomeres e. mesoderm
The study of the frequency and distribution of a disease in a defined population is
A. epidemiology. B. pathology. C. immunology. D. clinical microbiology. E. medicine.