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

Biology & Microbiology

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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.

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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.

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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

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In eukaryotic cells, proteins always remain in the nucleus but DNA is made at ribosomes in the cytoplasm

a. true b. false

Biology & Microbiology