Question 11

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

The passage illustrates how poison frogs have evolved specific changes in their nicotinic acetylcholine receptors, enabling them to tolerate the very toxins they produce. This adaptation is crucial for their survival, as it allows them to utilize these potent neurotoxins without suffering from self-poisoning.

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

This option is correct because the passage explicitly describes how poison frogs have evolved amino acid changes that prevent the neurotoxin epibatidine from being harmful to them. This adaptation allows them to safely store and utilize toxins without experiencing toxicity themselves.

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

This option is incorrect as the passage does mention that epibatidine is a potent painkiller; however, it does not suggest that it could be used as a pain relief option for humans. It states that epibatidine has not been tested in humans due to its lethal effects on rodents, indicating that its potential for human use is not established.

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

This option is misleading because, while poison frogs do obtain toxins from their diet, the passage emphasizes the evolutionary adaptations that allow them to protect themselves from their own toxins rather than detailing a process of creating toxic substances for predation defense.

D) can be grouped based on the changes they've made to their nicotinic acetylcholine receptors

This option is partially accurate since the passage mentions that several groups of frogs have independently evolved changes in their receptors. However, it does not specifically state that these groups can be classified or grouped in a systematic way based on those changes, making this option less relevant to the main idea.

Conclusion

The primary focus of the passage is on the adaptations of poison frogs that allow them to avoid self-toxicity from their own skin toxins. Option A captures this central theme effectively, while the other options either stray from the main idea or misinterpret the information provided. Thus, Option A stands out as the clear and correct answer.