Examkin

Soru

Zorluk: ZorExplicit Details

The Pompeii worm (*Alvinella pompejana*) thrives near deep-sea hydrothermal vents, experiencing temperature gradients ranging from 20∘C20^\circ\text{C} to over 80∘C80^\circ\text{C}. To survive these extreme thermal fluctuations, the worm is coated with a thick layer of epibiotic bacteria. Researchers led by Dr. Elena Vance investigated this relationship and discovered that these bacteria secrete a specialized mucus rich in heat-shock proteins. Rather than acting as a simple physical barrier, this secretion actively modulates the localized chemical environment by binding to heavy metal ions present in the vent emissions, thereby preventing toxic accumulation in the worm’s epidermal cells. However, the study noted that the bacteria rely entirely on the worm’s vascularized parapodia to obtain oxygen from the surrounding water, showing that the symbiosis is mutually dependent for gas exchange and detoxification.

According to the text, which statement is true about the mucus secreted by the epibiotic bacteria on the Pompeii worm?

  1. A
    It is produced in response to the worm's vascularized parapodia releasing oxygen into the surrounding water.
  2. B
    It serves as a physical shield that keeps the worm's epidermal cells at a constant temperature of 20∘C20^\circ\text{C}.
  3. It prevents the buildup of toxic materials in the worm's skin cells by binding to metal ions in the vent emissions.Cevap
  4. D
    It assists the bacteria in capturing oxygen directly from the worm's vascularized parapodia.

Cevap

The correct answer is the option stating that the mucus prevents the buildup of toxic materials in the worm's skin cells by binding to metal ions in the vent emissions.
The correct answer is supported by the text's explanation that the bacterial mucus actively modulates the chemical environment by binding to heavy metal ions from the vent, preventing toxic accumulation in the worm's epidermal (skin) cells.

Adım Adım Çözüm

1
Identify the target of the question, which asks about what the text explicitly states regarding the mucus secreted by the epibiotic bacteria.
The focus is narrowed down to the sentences discussing the function of the mucus secretion.
This aligns the search with the explicit detail requested in the prompt.
2
Locate the specific detail in the text describing the mucus.
The text states that the mucus actively modulates the localized chemical environment by binding to heavy metal ions present in the vent emissions, thereby preventing toxic accumulation in the worm's epidermal cells.
This provides the direct textual support needed to identify the correct answer.
3
Evaluate the options against this finding and select the option that directly matches this detail without introducing extra assumptions.
The option describing how the mucus binds to metal ions to prevent toxic buildup in the skin cells matches the text precisely.
An explicit details question requires an option that is a direct paraphrase of information stated in the text.

Anahtar Kavram

Explicit Details
Tahmini Süre:2m 0s
Bu soruyu puanla

Konular

Explicit Details

Bu konudan daha fazla soru