Difficulty: Easy

Average Score: 100%

Read the passage(s) below and answer the question based on what is stated or implied in the passage(s) and in any introductory material that may be provided.
Passage
Poison frogs become poisonous by isolating chemicals from their food and storing them in their skin. One such compound, epibatidine, is a stronger painkiller than morphine, but has not been tested in humans because even low doses are deadly to rodents. But for the frogs themselves, this powerful neurotoxin is totally impotent.
According to a study published in Science, several groups of epibatidine-bearing frogs have independently evolved amino acid changes in the toxin's target, the nicotinic acetylecholine receptor. These modifications allow the amphibians to escape self-toxicity.
Adapted from Abby Olena, "How Porson Frogs Avaid Poisoning Themselves. ©2017 by The Scientist

The main idea of the passage is that some types of poison frogs

Rationale

Some types of poison frogs have developed the capacity to protect themselves from the poison they carry in their skin.

This statement highlights the unique adaptation of poison frogs, which allows them to thrive despite the toxicity of their own skin. This adaptation is essential for their survival and sets them apart in the animal kingdom.

A (have developed the capacity to protect themselves from the poison they carry in their skin) CORRECT

This choice accurately reflects the passage's main idea, emphasizing the evolutionary adaptation of poison frogs. These frogs have evolved mechanisms that enable them to tolerate and utilize their own toxic secretions for defense against predators, showcasing a remarkable survival strategy.

B (could eventually produce a natural pain relief option for people who suffer from headaches) YOUR ANSWER

While the potential medical benefits of toxins from various species are a topic of interest, this choice strays from the main focus of the passage. The passage does not discuss the therapeutic applications of poison frog toxins, thus making this choice irrelevant to the main idea presented.

C (combine chemicals from their food to create a toxic substance that keeps them safe from predators) YOUR ANSWER

This option incorrectly suggests that poison frogs create their toxins from dietary sources. In reality, many poison frogs derive their toxicity from specific chemicals found in their environment, not by combining them. This misunderstanding misrepresents the biological processes involved in their toxicity.

D (can be grouped based on the changes they've made to their nicotinic acetylecholine receptors) YOUR ANSWER

This choice introduces a specific biological mechanism that is not addressed in the passage. While nicotinic acetylcholine receptors may play a role in the physiology of these frogs, the passage's main idea focuses on their ability to handle their own toxins rather than any receptor changes.

Conclusion

The passage centers on the remarkable adaptation of some poison frogs to survive with their own toxins, highlighting a unique aspect of their biology that is crucial for their defense mechanisms. While other choices present interesting ideas, they do not align with the main theme of the passage regarding self-protection against their own poison. Understanding this adaptation is vital for appreciating the evolutionary strategies of these fascinating amphibians.

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