Cell Cultures and Characteristics
Intestinal bacteria can grow in the presence of __________ whereas nonintestinal bacteria are usually inhibited.

low levels of nitrogen
sugars
bile salts
low concentration of various dyes

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Cell Cultures and Characteristics
Which of the following problem makes it impossible to satisfy all of Koch's postulates?

Genes from the microorganism cannot be amplified by PCR
Microorganism causes serious symptoms in humans
Microorganism cannot be isolated in pure culture
Species of microorganism is in question

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