Cell Cultures and Characteristics
The medium which allows the growth of more than one microorganisms of interest but with morphologically distinguishable colonies is known as

differential medium
none of these
selective medium
enrichment medium

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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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