Exercise: Cell Cultures And Characteristics

Questions for: Cell Cultures And Characteristics

Which of the following problem makes it impossible to satisfy all of Koch's postulates?
A:
Microorganism causes serious symptoms in humans
B:
Microorganism cannot be isolated in pure culture
C:
Species of microorganism is in question
D:
Genes from the microorganism cannot be amplified by PCR
Answer: B
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Intestinal bacteria can grow in the presence of __________ whereas nonintestinal bacteria are usually inhibited.
A:
bile salts
B:
low concentration of various dyes
C:
sugars
D:
low levels of nitrogen
Answer: A
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Which of the following techniques may be performed quantitatively to determine the number of bacteria of a particular type?
A:
Pour plate
B:
Spread plate
C:
Both (a) and (b)
D:
Streak plate technique
Answer: C
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Cell counting can be carried out by
A:
direct microscopic count using petroffhansser counting chamber
B:
plate counting
C:
membrane filter count
D:
all of the above
Answer: D
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Important example(s) of enriched medium/media is/ are
A:
Loeffler's serum slope
B:
Bordet-gengou medium
C:
Blood agar
D:
All of these
Answer: D
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