Tissue biopsy taken from a puncture wound is:
a. Is acceptable, however an aspirate would not contain contaminating flora
b. Is acceptable, and is the optimal specimen for anaerobic culture
c. Is unacceptable, due to the high level of potential contaminating flora
d. Is unacceptable, because the sample is not considered anaerobic
A
Because indigenous anaerobes are often present in large numbers as normal flora on mucosal surfaces, even minimal contamination of a specimen can give misleading results. In general, ma-terial for anaerobic culture is best obtained by tissue biopsy or by aspiration using a needle and syringe.
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An astrocyte is a type of:
A. glial cell. B. sensory neuron. C. interneuron. D. motor neuron.
How is recombinant DNA introduced into bacterial cells?
A. Most bacterial cells are naturally competent so DNA just needs to be mixed with the cells. B. Many bacterial cells can be transformed after being made competent by treatment with cold CaCl followed by a brief heat shock at 43°C. C. Many bacterial cells can be transformed by applying high voltage to a mixture of cells and DNA for a sustained period of time. D. Transformation can occur if DNA is mixed with bacterial cells that have been heat shocked. E. None of these choices are correct.
Most individuals in academia are basic researchers, funded through research grants from agencies or foundations. Based on your knowledge of applied research, an industrial company would most likely employ individuals
A. who develop alternative fuel sources. B. who identify a new species of beetle in the Amazon rainforest. C. looking at novel proteins involved in the development of a neurological disease. D. who document fossils found in a specific archeological expedition.
Many of the spinal cord nerve tracts ____
a. are unmyelinated b. contain dendrites and cell bodies c. are found in the central portion of the cord d. are classified as white matter e. extend from the brain to the thoracic spinal cord region