Nightingale Microbiology Practice Exam

What is the correct hierarchical order for virus classification?

order, family, subfamily, genus, species. order, subfamily, family, genus, species. family, order, subfamily, genus, species. order, family, genus, subfamily, species.

Correct Answer:

order, family, subfamily, genus, species.

Explanation:

In virus taxonomy, groups are arranged from broad to specific to reflect relatedness and shared traits. The order is the broadest level among these ranks, followed by family, then subfamily, then genus, and finally species, which is the most specific unit. This structure makes sense because a single order contains several families that share major characteristics; within a family, subfamilies can group more closely related genera; genera encompass species that are very similar in important ways; and species define a distinct lineage with its own properties. Naming conventions reinforce this hierarchy, with family names ending in -viridae, subfamily in -virinae, genus in -virus, and species typically named as a specific virus.

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