Post on 11-May-2015
2007-2008 AP Biology
DomainBacteria
DomainArchaea
DomainEukarya
Common ancestor
Kingdom: 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
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
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
AP Biology
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
malariaGiardia 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 + animals key ecological role at base of
marine food web
Mmmmmm!Sounds like breakfast!
2007-2008 AP Biology
Any Questions??