7Animal-Like Protista & Disease MalariaCaused by: PlasmodiumVector: MosquitoesEffects in humans: Fatigue, fever, vomiting, coma, deathSleeping sicknessCaused by: TrypanosomaVector: Tsetse fliesEffects in humans: Coma & death
8Plant-like Protista AKA: Algae Most unicellular; No leaves, stems, rootsPerform photosynthesis with chloroplastsClassified by their type of cell wall1) Euglenoids: use flagella to swimAnimal & plant-like2) DinoflagellatesMost (~ 90%) planktonBasis of aquatic food chains3) DiatomsGlasslike shellsProvide ~ ½ the O2 on earthGreen algaeRed algaeBrown algae
10Fungus-like Protista Basic Features: 2 major groups: 1) Slime Molds Decomposers: Absorb and recycle nutrientsLive in moist environments2 major groups:1) Slime Moldslarge (~1 meter) single celled mass of cytoplasmFungus-like (absorbs food)Animal-like (can move)2) Water molds: Can be parasiticEx: Potato blight: caused Irish potato famine (1840’s)
12Origins of Multicellularity Protista live in 3 arrangements…1) Single-celledLive by themselves2) ColonialGroup of independent acting cellsNo specialized cells3) MulticellularCells specialized to be specific jobsImportance:Cells in colonies became efficient at certain tasks.Cells & their offspring became specialized and dependent on each other.= ANCESTORS OF MULTICELLULAR LIFEThis is a colony of cells called VolvoxUnicellular EuglenaMulticellular Kelp
13And lastly (if you couldn’t tell already)… Protists are difficult to classify Protista is one kingdom in the domain Eukarya.Some protists are not closely related.Molecular evidence supports reclassification.Protista classification will likely change.
14REview 1) Name the three categories of protista. 2) Which category of protista has members that are able to move?3) Which category of protista has members that absorb nutrients?4) Which category of protista has members that are heterotrophs?5) Which category of protista has members that hunt?6) How does a pseudopod, flagella, and cilia differ?7) Name the 3 major categories of protozoa.8) Name the 3 major categories of algae.9) Name the 2 major categories of fungus-like protista.