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Protists Simply Eukaryotes Domain Bacteria Regents Biology Domain Archaebacteria Domain Eukaryotes 2006-2007 Common ancestor General characteristics Classification criteria eukaryotes not animal, plant or fungi That’s more of what they’re not & not what they are! Regents Biology Protist Diversity A great variety in ways of life one-celled to many-celled ___________________________________ ___________________________________ asexual to sexual reproduction pathogens to beneficial sessile to mobile Regents Biology Mobility How Protists move flagellum cilia pseudopod Regents Biology Protist Diversity Animal-like Protists ____________________ Amoeba Paramecium Stentor Amoeba ingesting a Paramecium Regents Biology Paramecium with food vacuoles stained red Protist Diversity Plant-like Protists _________________________ Euglena algae diatoms Regents Biology Protist Diversity Parasitic & pathogen Protists malaria Giardia trypanosomes Plasmodium Giardia Regents Biology Trypanosoma Protist Diversity Beneficial & necessary Protists ______________________ small algae + diatoms much of the world’s photosynthesis produces ~90% of atmospheric oxygen ______________________ heterotroph protists key ecological role at base of marine food web Regents Biology Mmmmmm! Keeps me goin’! Any Questions?? Regents Biology 2006-2007 Any Questions?? Regents Biology 2006-2007 Why is a huge single-celled creature not possible? Regents Biology Great Diversity Regents Biology Problems with Protist Classification Too Diverse! Regents Biology Theory of Endosymbiosis internal membrane system aerobic bacterium Eukaryotic cell with mitochondrion Ancestral eukaryotic cell chloroplast mitochondrion photosynthetic bacterium Regents Biologycell with chloroplasts Eukaryotic Paramecium & symbiont Chlorella