General characteristics Classification criteria eukaryotes not animal, plant or fungi That’s more ofwhat they’re not & not what they are!AP Biology
AP Biology eu gle no ids din ofl & agel cil iat lates es Great Diversity bro & d wn a iat lga om e s red alg ae gre ena lga e mi sc ell an eo us ?
Problems with Protist Classification Too Diverse! doesn’t reflect any evolutionary relationship amongst all kingdom members paraphyletic ) ts an ho i lan ta da pl y d ll i ng des ph (in re ta la ge oa Fuclu to pi St phy ea s ria la al p oz o ha a of C ta en te m o at en an rc y ac or ni m l ph eo gl A A hl B ra Eu do lv St C A ho R Something’s not right here!AP Biology
Theory of Endosymbiosis mitochondrion internal aerobic membrane bacterium system Ancestral eukaryotic cell Eukaryotic cell with mitochondrion photosynthetic bacteriumchloroplast AP Biology Eukaryotic cell with chloroplasts Paramecium & symbiont Chlorella
Protist Diversity The full spectrum of modes of life from unicellular to multicellular autotrophic to heterotrophic asexual to sexual reproduction pathogenic to beneficial sessile to mobileAP Biology
Protist Diversity Beneficial & necessary Protists phytoplankton small algae + diatoms much of the world’s photosynthesis produces ~90% of atmospheric oxygen zooplankton heterotrophic protists + animals key ecological role at base of marine food web Mmmmmm! Sounds like breakfast!AP Biology