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

none of these
special nitrogen source
special carbon source
pathogenic properties

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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
Species of microorganism is in question
Microorganism causes serious symptoms in humans
Microorganism cannot be isolated in pure culture

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