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Difficulty: HardPrinciples of Classification and Binomial Nomenclature

A botanist cataloged four organisms from a conservation area along with their proposed scientific names:
1. *Periplaneta americana*
2. *Manihot esculenta* Crantz
3. *Saccharomyces cerevisiae*
4. *rhizobium leguminosarum*

Based on the fundamental principles of biological classification and Linnaean binomial nomenclature, which of the following conclusions is correct?

  1. The scientific designation of the nitrogen-fixing bacterium is incorrectly written because the generic name begins with a lowercase letter.Answer
  2. B
    The designation *Manihot esculenta* Crantz is improper because author citations following binomial names must always be italicized.
  3. C
    *Saccharomyces cerevisiae* is grouped in Kingdom Monera due to its unicellular structure and extracellular saprophytic digestion.
  4. D
    The cellular boundary of *Manihot esculenta* contains peptidoglycan, which serves as the primary structural polymer across all plant cell walls.

Answer

The scientific designation of the nitrogen-fixing bacterium is incorrectly written because the generic name begins with a lowercase letter.
The correct conclusion identifies that 'rhizobium leguminosarum' violates Linnaean binomial rules because the genus name must begin with a capital letter ('Rhizobium').

Step-by-Step Solution

1
Analyze the binomial nomenclature rules for genus and species names.
Binomial nomenclature requires the genus name to start with a capital letter and the species epithet to start with a lowercase letter. Both names must be italicized or underlined.
This establishes a standardized international naming convention across all biological disciplines.
2
Evaluate the four listed scientific names against standard formatting and classification rules.
The name 'rhizobium leguminosarum' starts with an uncapitalized genus name ('rhizobium'), violating Linnaean formatting rules.
Correct formatting demands 'Rhizobium leguminosarum'.
3
Verify author citation rules and kingdom-level cellular features in the remaining choices.
Author names (Crantz) are non-italicized additions; yeast is a eukaryotic fungus (not Monera); cassava cell walls contain cellulose (not peptidoglycan).
Confirming these principles validates the correct choice and refutes all distractors.

Key Concept

Rules of Linnaean Binomial Nomenclature and Kingdom Classification
Estimated Time:2m 0s
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Topics

Principles of Classification and Binomial Nomenclature

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