Examkin

Soru

Zorluk: KolayInferences from the Text

Magnetotactic bacteria synthesize intracellular chains of magnetic mineral crystals known as magnetosomes, which allow the organisms to align passively with Earth's geomagnetic field lines. While freshwater species predominantly produce magnetite (Fe3O4Fe_3O_4), an iron oxide formed under low-sulfide conditions, species inhabiting marine and brackish sulfidic environments produce greigite (Fe3S4Fe_3S_4), an iron sulfide mineral. Because magnetite rapidly degrades through oxidation in hydrogen-sulfide-rich water, bacteria producing greigite rather than magnetite are better adapted to survive in sulfur-heavy aquatic sediments.

Which of the following statements can most reasonably be inferred from the passage?

  1. A
    Magnetotactic bacteria found in sulfur-heavy aquatic sediments synthesize magnetite crystals that are resistant to sulfur-induced degradation.
  2. B
    Bacteria inhabiting sulfidic aquatic sediments are generally unable to orient themselves along geomagnetic field lines.
  3. Magnetotactic bacteria surviving in sulfur-heavy aquatic sediments are more likely to produce greigite than magnetite.Cevap
  4. D
    Freshwater environments typically have higher concentrations of hydrogen sulfide than marine or brackish environments do.
  5. E
    The mineral composition of a magnetosome determines the swimming speed of the bacterium carrying it.

Cevap

Magnetotactic bacteria surviving in sulfur-heavy aquatic sediments are more likely to produce greigite than magnetite.
The passage explicitly establishes that greigite is produced by species in sulfidic environments and that greigite-producing bacteria are better adapted to survive in sulfur-heavy aquatic sediments because magnetite degrades rapidly in hydrogen sulfide. Therefore, surviving magnetotactic bacteria in these environments are more likely to produce greigite than magnetite.

Adım Adım Çözüm

1
Locate relevant textual statements regarding sulfur-heavy environments and mineral types
The text notes that species in sulfidic environments produce greigite, while magnetite oxidizes and degrades in hydrogen-sulfide-rich water, conferring a survival advantage to greigite producers.
Answering an inference question requires finding explicit premises that logically entail the unstated conclusion.
2
Synthesize the premises into a direct logical deduction
Because magnetite degrades in sulfidic environments and greigite-producing species survive better there, bacteria found in such sediments are predominantly greigite producers.
Combining the adaptation advantage with the degradation of magnetite supports the relative likelihood of greigite synthesis in sulfidic sediments.
3
Evaluate and eliminate unsupported distractors
Eliminate options that contradict textual details, reverse environmental conditions, or import outside concepts like swimming speed.
LSAT reading comprehension inference questions demand strict adherence to passage scope without speculative leaps.

Anahtar Kavram

Textual Inference via Local Synthesis
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Inferences from the Text

Bu konudan daha fazla soru