Cell Cultures and Characteristics
Cell counting can be carried out by

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

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

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