Cell Cultures and Characteristics
Cell counting can be carried out by

membrane filter count
plate counting
direct microscopic count using petroffhansser counting chamber
All of these

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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
Microorganism cannot be isolated in pure culture
Genes from the microorganism cannot be amplified by PCR

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