Protists Domain Eukarya Domain Bacteria Domain Archaea AP

Protists Domain Eukarya Domain Bacteria Domain Archaea AP Biology Common ancestor Domain Eukarya

General characteristics § Classification criteria eukaryotes u not animal, plant or fungi u AP Biology

AP Biology an ell sc mi s? eo u ae alg en gre red bro & d wn a iat lga om e s & c agel ilia late tes s ofl din ids no gle eu Great Diversity

AP Biology pi la en o C yt a hl or o St phy (in re ta p Fuclud to ng es ph y C ho i lan ta d an pl of an la ts ge ) A ni lli m da al s ph ho do R ra m St at a eo l lv A zo a en o gl Eu ea rc ha A ria ac te B Problems with Protist Classification § Too Diverse!

Theory of Endosymbiosis internal membrane system aerobic bacterium Eukaryotic cell with mitochondrion Ancestral eukaryotic cell chloroplast mitochondrion photosynthetic bacterium AP Biology Eukaryotic cell with chloroplasts Paramecium & symbiont Chlorella

Protist Diversity § The full spectrum of modes of life from unicellular to multicellular u autotrophic to heterotrophic u asexual to sexual reproduction u pathogenic to beneficial u sessile to mobile u AP Biology

Mobility § How Protists move flagellum u cilia u pseudopod u AP Biology

Protist Diversity § Animal-like Protists u heterotrophs, predators § Amoeba § Paramecium § Stentor Amoeba ingesting a Paramecium AP Biology Paramecium with food vacuoles stained red

Protist Diversity § Excavata Modified mitochondria u Unique flagella u Giardia Trypanosoma u AP Biology

Protist Diversity § Chromalveolata Photosynthetic u Parasitic u § Kelp § Plasmodium § Diatoms AP Biology

Protist Diversity § Rhizaria Thread-like pseudopods u Predators u § Amoeba AP Biology

Protist Diversity § Archaeplastida Photosynthetic u Closely related to plants u § Seaweed § Volvox AP Biology

Protist Diversity § Unikonta Tube shaped pseudopods u Closely related to animals u § Amoeba § Slime molds AP Biology

Protist Diversity § Plant-like Protists u autotrophs, photosynthesis § Euglena § algae § diatoms AP Biology

Protist Diversity § Parasitic & pathogenic Protists malaria u Giardia u trypanosomes u Plasmodium Giardia AP Biology Trypanosoma

Protist Diversity § Beneficial & necessary Protists u phytoplankton § small algae + diatoms § much of the world’s photosynthesis § produces ~90% of atmospheric oxygen u zooplankton § heterotrophic protists + § key ecological role at base of marine food web AP Biology

Any Questions? ? AP Biology