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Difficulty: Very hardRhetorical Synthesis: Comparison and Contrast

While researching bioluminescent insects, a student took the following notes:

* *Photinus pyralis* is a North American firefly species that flashes to attract mates.
* The light-producing reaction in *Photinus pyralis* is ATP-dependent, requiring the enzyme luciferase.
* *Arachnocampa luminosa* is a cave-dwelling gnat species endemic to New Zealand.
* The larvae of *Arachnocampa luminosa* glow continuously to lure prey into sticky webs.
* The bioluminescent pathway in *Arachnocampa luminosa* is ATP-independent and utilizes a novel luciferase enzyme.

The student wants to contrast both the biological purposes and the biochemical mechanisms of bioluminescence in the two species. Which choice most effectively uses information from the given notes to accomplish this goal?

  1. A
    Although *Photinus pyralis* is a North American firefly that flashes to attract mates, *Arachnocampa luminosa* is a New Zealand gnat whose larvae glow to capture prey.
  2. B
    The bioluminescent reaction of *Photinus pyralis* is ATP-dependent and requires the enzyme luciferase, whereas the pathway of *Arachnocampa luminosa* is ATP-independent and uses a novel luciferase.
  3. While *Photinus pyralis* uses an ATP-dependent reaction with luciferase to attract mates, *Arachnocampa luminosa* relies on an ATP-independent pathway to lure prey.Answer
  4. D
    Both *Photinus pyralis* and *Arachnocampa luminosa* utilize forms of luciferase, but *Photinus pyralis* uses an ATP-independent mechanism to lure prey, whereas *Arachnocampa luminosa* uses an ATP-dependent mechanism to attract mates.

Answer

The correct option is the one stating that *Photinus pyralis* uses an ATP-dependent reaction with luciferase to attract mates, while *Arachnocampa luminosa* relies on an ATP-independent pathway to lure prey.
The option stating that *Photinus pyralis* uses an ATP-dependent reaction with luciferase to attract mates, while *Arachnocampa luminosa* relies on an ATP-independent pathway to lure prey, is correct because it successfully integrates and contrasts both key dimensions requested by the prompt: the biological purposes (attracting mates versus luring prey) and the biochemical mechanisms (ATP-dependent versus ATP-independent).

Step-by-Step Solution

1
Analyze the prompt to identify the specific rhetorical goals.
The student must accomplish two tasks: contrast the biological purposes of bioluminescence and contrast the biochemical mechanisms of bioluminescence in the two species.
This establishes the criteria for evaluating the choices.
2
Extract facts about the biological purposes of bioluminescence from the notes.
*Photinus pyralis* uses bioluminescence to attract mates, while *Arachnocampa luminosa* uses it to lure prey.
These facts are required to fulfill the first half of the rhetorical goal.
3
Extract facts about the biochemical mechanisms of bioluminescence from the notes.
The reaction in *Photinus pyralis* is ATP-dependent, while the reaction in *Arachnocampa luminosa* is ATP-independent.
These facts are required to fulfill the second half of the rhetorical goal.
4
Evaluate the choices against the extracted criteria.
The option comparing the ATP-dependent mating signal of the firefly with the ATP-independent prey-luring pathway of the gnat is the only choice that addresses both differences accurately.
This ensures the selected answer fully addresses the synthesis prompt.

Key Concept

Rhetorical Synthesis: Comparison and Contrast
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Topics

Rhetorical Synthesis: Comparison and Contrast

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