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Difficulty: HardPrinciples of Classification and Binomial Nomenclature

A taxonomist documented four specimens during a biodiversity survey, recording their proposed scientific names alongside key structural characteristics:

* Specimen I: *amoeba proteus* — unicellular eukaryote with pseudopodia.
* Specimen II: *Rhizopus stolonifer* — multicellular eukaryotic heterotroph possessing a chitinous cell wall.
* Specimen III: *Bacillus subtilis* — unicellular prokaryote with a cell wall composed primarily of cellulose.
* Specimen IV: *Rabies virus* — acellular nucleoprotein entity classified under Kingdom Monera.

Which specimen entry strictly complies with the rules of binomial nomenclature while accurately stating its diagnostic kingdom-level characteristic?

  1. A
    Specimen I, because the species epithet and generic name are written in italics.
  2. Specimen II, because the generic name is capitalized, the specific epithet is lowercase, and chitin is the major structural cell wall component of Fungi.Answer
  3. C
    Specimen III, because the name is italicized and bacterial cell walls are constructed from cellulose.
  4. D
    Specimen IV, because viral nomenclature follows standard Linnaean binomial rules within Kingdom Monera.

Answer

Specimen II is the only entry that strictly complies with binomial nomenclature formatting and features an accurate diagnostic kingdom-level trait.
The choice identifying Specimen II is correct because *Rhizopus stolonifer* adheres perfectly to Linnaean binomial rules (Genus capitalized, specific epithet lowercase, set in italics) and accurately reflects that fungi possess cell walls made of chitin.

Step-by-Step Solution

1
Analyze binomial nomenclature formatting rules across all four specimens.
Specimen I fails because the generic name *amoeba* is not capitalized. Specimen II (*Rhizopus stolonifer*) and Specimen III (*Bacillus subtilis*) follow binomial rules (capitalized genus, lowercase species epithet, italicized). Specimen IV uses a common English name format, as viruses do not follow formal Linnaean binomial nomenclature.
Binomial nomenclature requires a capitalized Genus name and a lowercase species epithet, both printed in italics or underlined when handwritten.
2
Evaluate the biological and kingdom-level diagnostic statements for the correctly formatted scientific names.
Specimen II correctly states that *Rhizopus stolonifer* (a fungus) has a chitinous cell wall. Specimen III incorrectly attributes a cellulose cell wall to a bacterium (*Bacillus subtilis*), whereas bacterial cell walls consist of peptidoglycan.
Taxonomic classification relies on fundamental cell wall composition and cellular organization to place organisms into appropriate biological kingdoms.
3
Synthesize results to identify the valid specimen entry.
Specimen II satisfies both nomenclature formatting and biological accuracy.
Only Specimen II meets all statutory rules of binomial designation and kingdom diagnostics.

Key Concept

Rules of Binomial Nomenclature and Diagnostic Characteristics of Biological Kingdoms
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Topics

Principles of Classification and Binomial Nomenclature

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