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Protists Chapter 21 What are Protists? • Protists are eukaryotic organisms that can’t be classified as fungi, plants, or animals • Multicellularity found in some prokaryotes allow cells to specialize, which, in turn, allows for the development of tissues, organs, and organ systems Reproduction • Protists can reproduce asexually by – Binary fission: Reproduction by replicating DNA and splitting in half – Budding: When part of a parent organism pinches off and forms a new organism – Fragmentation: When part of an organism is broken off and a new organism starts • Protists can reproduce sexually as a response to environmental stress Groups of Protists • Protists are commonly grouped by how they get nutrition • This leaves us with three groups: Animal-Like Protists • These protists ingest other organisms to obtain energy (heterotrophic by ingestion), like animals! • They are all unicellular • Most can move Plant-Like Protists • These protists get energy through photosynthesis, like plants! • Most are multicellular Fungus-Like Protists • These protists absorb nutrients from the environment (heterotrophic by absorption), like fungi! Pathogenic Protists • Malaria is caused by the animal-like protists Plasmodium • It is spread by the bite of a mosquito • If left untreated, it can cause rupture of the spleen, kidney failure, coma, brain damage, and death • Malaria Video
