Transcript Protists - Explore Biology

Protists
Simply Eukaryotes
Domain
Bacteria
Regents Biology
Domain
Archaebacteria
Domain
Eukaryotes
2006-2007
Common ancestor
General characteristics
 Classification criteria
eukaryotes
 not animal, plant or fungi

That’s more of
what they’re not
& not
what they are!
Regents Biology
Protist Diversity
 A great variety in ways of life

one-celled to many-celled

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asexual to sexual reproduction
 pathogens to beneficial
 sessile to mobile

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Mobility
 How Protists move
flagellum
 cilia
 pseudopod

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Protist Diversity
 Animal-like Protists

____________________
 Amoeba
 Paramecium
 Stentor
Amoeba ingesting a Paramecium
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Paramecium with food
vacuoles stained red
Protist Diversity
 Plant-like Protists

_________________________
 Euglena
 algae
 diatoms
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Protist Diversity
 Parasitic & pathogen Protists
malaria
 Giardia
 trypanosomes

Plasmodium
Giardia
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Trypanosoma
Protist Diversity
 Beneficial & necessary Protists

______________________
 small algae + diatoms
 much of the world’s photosynthesis
 produces ~90% of atmospheric oxygen

______________________
 heterotroph protists
 key ecological role at base of
marine food web
Regents Biology
Mmmmmm!
Keeps me goin’!
Any
Questions??
Regents Biology
2006-2007
Any Questions??
Regents Biology
2006-2007
Why is a huge
single-celled
creature not
possible?
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Great Diversity
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Problems with Protist Classification
 Too Diverse!
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Theory of Endosymbiosis
internal
membrane
system
aerobic
bacterium
Eukaryotic cell with
mitochondrion
Ancestral eukaryotic cell
chloroplast
mitochondrion
photosynthetic
bacterium
Regents
Biologycell with chloroplasts
Eukaryotic
Paramecium &
symbiont Chlorella