Multiple Choice
Which of the following characteristics is unique to animals?
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30. Overview of Animals
Overview of Animals
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In the overview of animals, how often can the mechanism in the nematocyst of a cnidarian be triggered?
A
Continuously without any limitations
B
Twice before needing to reset
C
Multiple times without any reset
D
Once, and then it cannot be reused
Verified step by step guidance1
Understand that a nematocyst is a specialized cell in cnidarians, such as jellyfish, used for capturing prey and defense.
Recognize that the nematocyst contains a coiled, thread-like structure that can rapidly uncoil and deliver toxins to the target.
Learn that the mechanism of a nematocyst is a one-time use system. Once it is triggered, the nematocyst cannot be reused.
After firing, the nematocyst must be replaced by a new one, which is produced by the cnidarian over time.
Conclude that the correct answer is that the nematocyst can be triggered once, and then it cannot be reused, as it is a single-use mechanism.
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