Cell Cultures and Characteristics
Cell counting can be carried out by

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

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

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