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

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

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

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

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