Air flow in a microbiology laboratory should be:
a. from lower to higher risk areas.
b. minimized as much as possible.
c. optimized to prevent the settling of dan-gerous aerosols.
d. well-filtered by recirculating it through numerous filters before recycling.
A
The air-handling system of a microbiology laboratory should move air from a lower to a higher risk area, never the reverse.
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A catalase-negative, non–spore forming, and gram-positive rod that is not acid-fast could possibly belong to which group of bacteria?
a. Corynebacterium b. Bacillus c. Actinomyces d. Erysipelothrix
If a test tube of whole blood is subjected to centrifugation, the cells will be packed in the bottom of the
tube and the fluid above it will be designated a. water. b. serum. c. lymph. d. interstitial fluid. e. plasma.
What component of the cell is the site of polypeptide assembly?
a. nucleus b. mitochondria c. vesicles d. ribosome e. lysosome
Generally, vaccines are used to stimulate the immune system by providing antigens of potential pathogens. What is the typical composition of a vaccine?
A) genes encoding for virulence factors B) RNA from bacteria C) naked DNA D) inactivated or attenuated viruses