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Protists

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by

Armaris Siurano

on 18 March 2015

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Transcript of Protists

Classifying Protists
Scientists classify protists by their method of obtaining nutrition.

Protists are divided into three groups: animal-like protists, plantlike protists, and fungus like protists.


Plant-like protists
They make their own food through
photosynthesis.

Yet, some can actually consume others when there is no light available.
Funguslike Protists
Protists
Protists are classified more easily by what they are
not
than by what they
are
.

Protists are
not

animals, plants, or fungi
because they do not have all of the characteristics necessary to place them in any of these kingdoms.
Domain Eukarya
Protists share one important trait: they are eukaryotes.

Like all eukaryotes, the DNA of protists is found within the membrane-bound nucleus.

Theme Focus
Protists are a group of
unicellular
and
multicellular
organisms that do not necessarily share evolutionary history.
Protists
Kingdom
Kingdom Protista was created to include this diverse group of more than
200,000
organisms.

Protists are usually subdivided according to the way they obtain food.
Difference
Although protists have a cellular structure similar to other eukaryotes, there are remarkable
differences
in their reproductive methods.

Some reproduce
asexually
by
mitosis
, while others
exchange genetic
material during
meiosis
Feed off dead organic matter.

Some slime molds can consume other organisms and some are even considered parasites.
The protozoan (Plural protozoa
or protozoans is an example
of an animal like protist because it is an heterotroph.

Some animal like protists are
parasites.
Euglenoid
Protozoa
Slime mold
http://izismile.com/2009/09/22/stunning_slime_mold_74_pics_1_gif.html
Habitat
Protists are typically found in damp or aquatic environments such as decaying leaves, damp soils, ponds, streams and oceans.
Protists also live in symbiotic relationships.

For example
microsporidia
is a microscopic protists that causes disease in insects.

Some species of microsporidia are used as insecticides.
Protist Origins
Lynn Marguliss proposed the theory of endosymbiosis.

Endosymbiosis states that eukaryotes formed when a large prokaryote engulfed a much smaller prokaryote and they learned to live in simbiosis.
Animallike protist
Full transcript