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Objectives 4.03 & 4.04: Disease-causing microorganisms & Parasites. Kingdom Protista. What is a Protist ?. Protists are eukaryotic organisms The kingdom Protista is the most diverse kingdom Some are microscopic while others are large.
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Objectives 4.03 & 4.04: Disease-causing microorganisms & Parasites Kingdom Protista
What is a Protist? • Protists are eukaryotic organisms • The kingdom Protista is the most diverse kingdom • Some are microscopic while others are large. • Some are unicellular while others are multicellular • Some are autotrophic while others are heterotrophic.
3 Main Groups • Animal-Like Protists(Protozoans): Paramecium & Amoebas • Plant-Like Protists: Algae • Fungus-Like Protists: Water Molds/Slime Molds
Animal-Like Protists • They are similar to animals in the following ways: • No cell wall • No chloroplasts, which makes them heterotrophs • They are different than animals in the following ways: • They are unicellular whereas animals are multicellular. • Examples: Paramecium & Amoebas
Plasmodium • Animal-Like protist that causes malaria. • Mosquito bites a person infected with malaria. • The plasmodium enters the mosquito and reproduces in the gut of the mosquito. • Plasmodium enters mosquito’s salivary glands. • Infects the next person the mosquito bites!
Plant-Like Protists • They are similar to plants in the following ways: • Have cell wall • Have chloroplasts, which makes them autotrophs • They are different than plants in the following ways: • They are motile (can move) • Their cell walls are made of chitin, where plant cells walls are made of cellulose • They have no roots, stems, or leaves • Examples: Algae & Euglena
Fungus-Like Protists • Fungus-Like Protists • They are similar to fungi in the following ways: • Decompose organic material, which makes them heterotrophs • They are different than fungi in the following ways: • Are motile • Have cell walls made of cellulose, where fungi have cell walls made of chitin. • Examples: Slime molds, water molds
Motile Protists • Motile protists have structures to help them move: • Pseudopods: Means “false foot” , made of cytoplasm • Flagella: Whip-like tail • Cilia: Tiny, hair-like extensions