Cell Cultures and Characteristics
A disease producing species occurring in a mixed culture can often be selected on the basis of its

pathogenic properties
none of these
special carbon source
special nitrogen source

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

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

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