Class III biological safety cabinets:
a. sterilize the air as it passes over the ma-terial in the cabinet.
b. protect the environment from contamina-tion by biological agents by filtering the air as it is exhausted from the cabinet.
c. are completely enclosed and have gloves that enable the worker to manipulate the material in the cabinet.
d. are often called laminar flow hoods.
C
Biological safety cabinets are designated by class according to the degree of biological contain-ment they provide, from the lowest level of containment (class I) to the highest level of contain-ment (class III).
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The pulmonary veins:
A. carry oxygenated blood from the lungs to the left atrium. B. carry deoxygenated blood from the lungs to the left atrium. C. carry oxygenated blood from the lungs to the right atrium. D. carry deoxygenated blood from the lungs to the right atrium. E. carry deoxygenated blood from the heart to the lungs.
Transfer of pathogens from host to environment and then to another host are said to be transmitted ________.
Fill in the blank(s) with the appropriate word(s).
The proteins encoded by the human mitochondrial genome function in
a. mitochondrial ribosomes. b. mitochondrial DNA polymerases. c. respiratory complexes and oxidative phosphorylation. d. Both a and c
Iodized salt provides the essential nutrient iodine. Iodine is important in preventing
A) menstrual cramps. B) a goiter. C) high blood pressure. D) gigantism. E) diabetes.