Examlex
Which of the following best describes the power or driving force for active transport?
Scolex
The head region of a tapeworm, containing suckers or hooks for attaching to the host's intestinal wall.
Nematocyst
A specialized cell in the tentacles of a jellyfish or other cnidarians, containing a barbed or venomous coiled thread that can be projected in self-defense or to capture prey.
Ascaris
A genus of parasitic nematode worms which can cause the infection ascariasis in humans through ingestion of eggs from contaminated sources.
Roundworm
Invertebrates with nonsegmented cylindrical body covered by a cuticle that molts; some forms are free-living in water and soil, and many are parasitic.
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