Transcript fis-teer-ee-uh

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Are all eukaryotic
creatures, meaning
their DNA is
enclosed in a
nucleus inside the
cell (unlike bacteria,
which are
prokaryotic and
have no nucleus to
enclose their DNA. Don Morrison
•Live anywhere there is
water
•Come in All sizes, but
many are microscopic
•Eukaryotic type cells
•Oldest around 1.5
billion years old
•Multicellular or
unicellular
Animal-like
Protists
(hetrotrophs)
Plant-like
Protists
(algae) =>
perform
photosynthesis
(autotrophs)
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Fungus- like
Protists =>
Decomposers
(mold)
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Protozoan - name for this type of
organism. The word protozoa means
"little animal."
Protozoa range in size from 1/5,000 to
1/50 of an inch
4 groups based on movement
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Sarcodinians
Zooflagllates
Ciliphorans
Sporozoans
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move by extending
their cytoplasm
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some are surrounded
by hard shells (ex.
Forminiferans &
radiolarians)
Amoebas have no
shells, pseudopod =>
extension of
cytoplasm used to
move and obtain food
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Generally the smallest of
the protozoa
Use flagella to move.
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Have one or several long,
whip-like projections called
flagella poking out of their
cells.
Example-trichonymphalive in termite gut
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Generally the largest
protozoa.
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Have hair-like
projections called cilia
<silly-uh>
Eat the other three
types of protozoa
Example Paramecium
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All the members of the
phylum are parasites. No
structure for movement.
The genus Plasmodium
causes malaria, one of the
greatest scourges of
humans. Malaria has
probably caused more
human deaths than any
other infectious disease;
even today it is estimated to
kill a million people a year in
the sub-Saharan Africa.
example Plasodium (causes
malaria)
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Unicellular algae
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Dinoflagellates
Diatoms
Euglenads
 Multicellular Algae
 Green Algae
 Red Algae
 Brown Algae
algae with 2 flagella, usually
found in saltwater Pfiesteria
<fis-teer-ee-uh> produce
toxic substances that stun
passing fish and cause
bleeding sores. The
Pfiesteria then feed on the
fish blood and fluids. (Red
Tide)
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Cell walls have silica,
very abundant in
Oceans.
The shells of dead
diatoms are mined to
make
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abrasives,
shiny road paint
and grit in toothpaste.
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Euglena is a typical
member of the group
(which numbers about
1600 species Most are
unicellular.)
Many swim by means of a
single flagellum.
They are not encased in a
cell wall so they are
flexible as well as motile.
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Most diverse group of
algae, with more than
7000 species growing
in a variety of
habitats.
Like the plants, the
green algae contain
two forms of
chlorophyll
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Approximately 4000
species have been
identified.
Their closest relatives are
the green algae and land
plants.
Some are used as food in
coastal regions of Asia.
Agar, the base for
culturing bacteria and
other microorganisms, is
extracted from a red alga
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The rockweeds and kelps.
Some kelps grow as long as
30 m.
All are multicellular although
without much specialization
of cell types.
Most are found in salt water.
Used for food in some
coastal areas of the world
and harvested in the U. S. for
fertilizer and as a source of
iodine
Slime Molds
 Cellular slime
mold
 Water mold
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Slime molds have traits
like both fungi and
animals.
Have very complex life
cycles involving multiple
forms and stages.
Spores are produced,
these spores are like
plant seeds. Each of
them becomes a new
amoeba-like cell when
they land and each
goes off on its merry
way.
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The organisms in this
group have a complex life
cycle during the course of
which they go through
unicellular, multicellular,
fungus-like (form spores)
and protozoan-like
(amoeboid) stages.
With the exception of one
species that causes
powdery scab on
potatoes, these
organisms are of little
economic importance.
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As their name
suggests, water
molds were once
considered to be
fungi. But unlike
fungi, the cell wall of
water molds is made
of cellulose, not
chitin.
Food for others (plankton)
Some eat bacteria
Some cause diseases
Help produce oxygen
Breakdown dead plants and animals
(decomposers)