Difficulty: Easy

Average Score: 100%

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 acetylcholine receptor. These modifications allow the amphibians to escape self-toxicity.

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.

The passage highlights the unique adaptation of poison frogs, which enables them to safely utilize the toxins they produce for self-defense against predators. This ability underscores the evolutionary significance of their chemical defenses while also addressing their vulnerability to those very poisons.

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

This option accurately reflects the main idea presented in the passage. It focuses on the adaptive strategy of poison frogs, emphasizing their ability to coexist with the toxins they produce, which is central to their survival mechanism.

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

While this choice suggests potential applications of toxins from poison frogs, it does not address the main idea of the passage regarding the frogs' self-protective adaptations. The focus is instead on a future benefit for humans, diverting from the frogs' inherent biological capabilities.

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

This statement misrepresents the key point of the passage. Although poison frogs do utilize toxins, the focus is on their internal capacity to manage these toxins rather than the process of combining chemicals from their diet, which is not explicitly discussed.

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

This choice introduces a specific biological mechanism that is not the primary focus of the passage. While receptor changes may be relevant to their toxicity, the central theme revolves around the frogs' protective adaptation to their own poisons, not classification based on receptor modifications.

Conclusion

The passage emphasizes the remarkable evolutionary adaptation of poison frogs, highlighting their ability to use their skin toxins for protection without suffering from their effects. This adaptation plays a crucial role in their survival, showcasing the intricate balance between defense mechanisms and vulnerability. Understanding this relationship is essential in studying the ecological and evolutionary dynamics of these fascinating amphibians.

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