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Which of the following is NOT used in defining a microbial species? A) DNA:DNA similarity as...

Which of the following is NOT used in defining a microbial species?

A) DNA:DNA similarity as determined by hybridization

B) SSU RNA sequence similarity

C) Similar cell shape as seen under the microscope

D) Phylogenetic reconstructions

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The SSU RNA sequence similarity is highly use in defining a microbial species. Other methods include DNA-DNA hybridization and phylogenetic reconstruction(based on evolutionary relationship). But cell shape is not used for microbial species classification. Hence, option C is incorrect.

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