Cell Cultures and Characteristics
When a substance is added to a liquid medium which inhibits the growth of unwanted bacteria and favors the growth of wanted bacteria, it is known as

enriched medium
differential medium
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?

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

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