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HESI BiologyNaming living things

Classification & TaxonomyHESI A2 cheat sheet

Naming living things

6 key facts 3 practice questions Reviewed Oct 2026
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The Hierarchy

  • Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
  • Broadest to most specific

Mnemonic

  • ORANGE)">Did King Philip Come Over For Good Soup

Binomial Naming

  • Genus species, italicized; genus capitalized
  • *Homo sapiens*

Domains

  • Bacteria, Archaea, Eukarya
Key takeaway

Naming living things

Before you read

Test yourself first: 3 questions

Question 1 of 3

Scientists organize living things into groups based on shared characteristics through:

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