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Difficulty: HardParallel Reasoning and Parallel Flaw

Biochemist: Any enzymatic inhibitor that halts bacterial cell wall synthesis in laboratory cultures targets transpeptidase enzymes. Furthermore, most chemical agents that target transpeptidase enzymes cause rapid osmotic lysis in exposed bacterial colonies. Compound K causes rapid osmotic lysis in exposed bacterial colonies. Therefore, Compound K must be an enzymatic inhibitor that halts bacterial cell wall synthesis in laboratory cultures.

The flawed pattern of reasoning in the biochemist's argument is most closely paralleled in which of the following arguments?

  1. A
    Any antibiotic that disrupts bacterial ribosome assembly inhibits cellular protein translation. Most compounds that inhibit cellular protein translation reduce cell culture viability. Compound M does not reduce cell culture viability. Therefore, Compound M is not an antibiotic that disrupts bacterial ribosome assembly.
  2. B
    Every architectural design that complies with municipal passive-solar standards incorporates high-thermal-mass flooring. The civic pavilion incorporates high-thermal-mass flooring. Therefore, the civic pavilion must be an architectural design that complies with municipal passive-solar standards.
  3. C
    Any municipal recycling initiative that achieves high participation rates provides automated curbside sorting bins. Some municipal programs that provide automated curbside sorting bins operate at a financial loss. Therefore, every waste management program operating at a financial loss is a municipal recycling initiative that achieves high participation rates.
  4. Any songbird vocalization that functions as a territorial defense display in temperate woodlands involves rapid frequency modulation. Most avian acoustic signals that involve rapid frequency modulation produce echoes that scatter off dense canopy foliage. The vocal call of the hooded warbler produces echoes that scatter off dense canopy foliage. Thus, the vocal call of the hooded warbler must be a songbird vocalization that functions as a territorial defense display in temperate woodlands.Answer
  5. E
    Every municipal water filtration facility that utilizes reverse osmosis eliminates trace microplastics. Most filtration facilities that eliminate trace microplastics require high-pressure membrane pumps. Facility 9 operates high-pressure membrane pumps. Therefore, Facility 9 is guaranteed to eliminate trace microplastics.

Answer

The argument concerning the vocal call of the hooded warbler and territorial defense displays in temperate woodlands.
The correct argument matches the stimulus in every structural element: it establishes a universal rule relating an initial category to a necessary feature, a majoritarian rule relating that feature to a resultant property, affirms the presence of that resultant property in a single subject, and invalidly concludes that the subject must belong to the initial category.

Step-by-Step Solution

1
Abstract the logical structure and premises of the stimulus argument
Premise 1: All A have property B (Universal conditional: A → B). Premise 2: Most things with property B exhibit characteristic C (Most B → C). Premise 3: Entity X exhibits characteristic C (X has C). Conclusion: Entity X must be an A (X is A).
Deconstructing the argument into symbolic logic isolates the exact reasoning pattern and flaw independently of topical content.
2
Identify the specific logical defect committed in the stimulus
The argument commits an illicit affirming-the-consequent flaw compounded by an unwarranted quantifier leap: it reasons backward from an entity possessing characteristic C (which only most B have) to concluding that the entity must belong to sufficient condition A.
Parallel Flaw questions require finding an option that duplicates the exact logical invalidity and structural steps.
3
Evaluate the answer choices against the abstracted template
The argument regarding the hooded warbler follows the identical pattern: All territorial displays (A) involve rapid frequency modulation (B); most rapid modulation signals (B) produce scattering echoes (C); the hooded warbler call produces scattering echoes (C); therefore, the call must be a territorial display (A).
Only an isomorphic match in quantifier force ('all', 'most'), modal certainty ('must'), and direction of logical error satisfies the parallel criteria.

Key Concept

Parallel Flaw: Affirming the Consequent via Quantifier Chain
Estimated Time:2m 0s
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Topics

Parallel Reasoning and Parallel Flaw

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