Question

multiple choice question
a bacterial or archaeal strain is best defined as ______

the most fully characterized and most representative member of a taxon
a collection of strains that have distinctive immunological reactivity
a collection of strains that share many stable properties and differ significantly from other groups of strains
the descendants of a single, pure microbial culture

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Explanation:

A bacterial/archaeal strain is defined as the progeny originating from a single, pure microbial culture. The other options describe different taxonomic or grouping concepts: the first refers to a type strain, the second describes a serovar, and the third defines a species.

Answer:

D. the descendants of a single, pure microbial culture