chapter 28 - protists
TRANSCRIPT
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2007-2008 AP Biology
DomainBacteria
DomainArchaea
DomainEukarya
Common ancestor
Kingdom: Protists
Domain Eukarya
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AP Biology
General characteristics Classification criteria
eukaryotes not animal, plant or fungi
That’s more ofwhat they’re not
& notwhat they are!
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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?
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AP Biology
Problems with Protist Classification
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
Something’snot right here!
Too Diverse! doesn’t reflect any evolutionary relationship
amongst all kingdom members paraphyletic
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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
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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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AP Biology
Mobility How Protists move
flagellum cilia pseudopod
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AP Biology
Protist Diversity Animal-like Protists
heterotrophs, predators Amoeba Paramecium Stentor
Paramecium with food vacuoles stained red
Amoeba ingesting a Paramecium
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AP Biology
Protist Diversity Plant-like Protists
autotrophs, photosynthesis Euglena algae diatoms
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AP Biology
Protist Diversity Parasitic & pathogenic Protists
malariaGiardia trypanosomes
Plasmodium
Giardia
Trypanosoma
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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 + animals key ecological role at base of
marine food web
Mmmmmm!Sounds like breakfast!
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2007-2008 AP Biology
Any Questions??