Adapted from: Kim Foglia, Explore BiologyAP Biology

DomainBacteria

DomainArchaea

DomainEukarya

Common ancestor

Protists

Domain Eukarya

AP Biology

General characteristics Classification criteria

eukaryotes not animal, plant or fungi

That’s more ofwhat they’re not

& notwhat they are!

AP Biology

Great Diversity

dino

flage

llate

s

& c

iliat

es

eugl

enoi

ds

brow

n al

gae

& d

iato

ms

red

alga

e

gree

n al

gae

mis

cella

neou

s?

AP Biology

Problems with Protist Classification Too Diverse!

Euglenozo

a

Animal

s

Strepto

phyta

(incl

udes la

nd pla

nts)

Choanofla

gellid

a

Fungi

Chloro

phyta

Rhodophyta

Stram

enopila

Alveo

lata

Archae

a

Bacte

ria

AP Biology

Theory of Endosymbiosis

Ancestral eukaryotic cell Eukaryotic cell withmitochondrion

internal membrane system

aerobic bacterium

mitochondrion

chloroplast

Eukaryotic cell with chloroplasts

photosyntheticbacterium

Paramecium & symbiont Chlorella

AP Biology

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 mobile

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Mobility How Protists move

flagellum cilia pseudopod

AP Biology

Protist Diversity Animal-like Protists

heterotrophs, predators Amoeba Paramecium Stentor

Paramecium with food vacuoles stained red

Amoeba ingesting a Paramecium

AP Biology

Protist Diversity Plant-like Protists

autotrophs, photosynthesis Euglena algae diatoms

AP Biology

Protist Diversity Parasitic & pathogenic Protists

malaria Giardia trypanosomes

Plasmodium

Giardia

Trypanosoma

AP Biology

Protist Diversity Beneficial & necessary Protists

phytoplankton small algae + diatoms much of the world’s photosynthesis produces ~90% of atmospheric oxygen

zooplankton heterotrophic protists + key ecological role at base of

marine food web

Mmmmmm!Keeps me goin’!

Adapted from: Kim Foglia, Explore BiologyAP Biology

Any Questions??