A ________ assay is most useful for determining the viability of a viral preparation.
A. direct (electron microscopic) count
B. plaque
C. PCR
D. hemagglutination
Answer: B
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As an added safety precaution, low-acid, home canned foods should be
A. eaten with spoons. B. boiled at least 15 minutes before consumption. C. frozen for 1 hour before consumption. D. dried prior to eating.
Trichloroethylene (TCE) is toxic to humans because it
A. depletes nitrogen from soils. B. is carcinogenic. C. contains heavy metals. D. prevents CO2 production by plants. E. causes a decrease in the yield of crop plants.
Which of the following characterizes Gram-positive bacteria?
a. the presence of an outer membrane b. the absence of ribosomes c. the presence of a thick cell wall d. the absence of a cell wall
In eukaryotic cells, proteins always remain in the nucleus but DNA is made at ribosomes in the cytoplasm
a. true b. false