All members of the Alveolata contain fl attened vesicles called alveoli. Dinofl agellates have pairs of fl agella arranged perpendicular to each other, which causes them to swim with a spinning...

All members of the Alveolata contain fl attened vesicles called alveoli. Dinofl agellates have pairs of fl agella arranged perpendicular to each other, which causes them to swim with a spinning motion. Blooms of dinofl agellates cause red tides. Apicomplexans are animal parasites that produce a structure called an apical complex, which is composed of cytoskeleton and secretory structures and aids in penetrating their host. The ciliates are unicellular, heterotrophic protists with cilia used for feeding and propulsion.

■ What would be a major difficulty in finding a poison to fight the malaria-causing protist Plasmodium?