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Kingdom Protista. Eukaryotes Unicellular or multicellular Very varied group. Origin and Diversity. Probably formed by cells taking in prokaryotic cells and keeping them as organelles Ex – mitochondria andchloroplasts were probably monerans that were captured .

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Eukaryotes unicellular or multicellular very varied group l.jpg

Kingdom Protista

Eukaryotes

Unicellular or multicellular

Very varied group


Origin and diversity l.jpg
Origin and Diversity

  • Probably formed by cells taking in prokaryotic cells and keeping them as organelles

    • Ex – mitochondria andchloroplasts were probably monerans that were captured


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Colonies formed before multicellular Protists

  • Once cells were growing together, they eventually developed specialized functions.

    • These eventually became attached and relied on each other for those functions. (Kind of like people who live in groups – they become specialized and begin to rely on each other.


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Protists are conveniently divided into three groups

  • Animal-Like Protists

    • heterotrophs

  • Plant-Like Protists

    • autotrophs

  • Fungus-Like Protists

    • Decomposers (heterotrophs that eat dead organic matter)


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Animal-like protists

  • Often called protozoans

  • Unicellular and don’t have specialized tissues, organs or organ systems.


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Animal-like protists - Sarcodines

  • Amoebas – move using pseudopods




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Animal-like protists - ciliophorans

These are cilia

  • Move using cilia

  • These are

    paramecia

This is its oral groove




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Animal-like protists – sporozoans –always parasites and no way to move on their own

  • Plasmodium is a parasite that you get from a mosquito bite. The disease it causes is malaria, which kills about 3 million people a year around the world. It lives in your red blood cells and

    destroys them.


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Plant-Like protists - algae

  • Autotrophic – by photosynthesis

  • Commonly called algae or seaweed

  • Unicellular or multicellular


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Unicellular algae

  • Food for other organisms

  • Dinoflagellates cause red tides and some other harmful algae blooms in the oceans.



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Diatoms – in fresh and salt water

Bottom of food

chain

Case made of silica

(glass-like)

Used for abrasives

and filters


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euglenoids

euglenoids



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Multicellular algae

Volvox – colony of

Flagellated single cells

  • almost multicellular


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Green algae

Predominant pigment is chlorophyll

Found in all types of water


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Red algae

  • Grow in warm salt water

  • Some grow very deep in the ocean or on ice


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Brown algae

  • Mostly saltwater

  • Grow in cool salt water

  • Includes largest Protists


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Fungus-like protists

  • Slime molds – creep along in an amoeba-like fashion


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Protists in the Biosphere

  • Some cause disease

    • Red tide

    • African sleeping sickness

    • Giardia

    • Potato blight

    • Malaria


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Good uses of protists

Plankton – bottom of

the food chain

Food – carageenan, agar, algin –

thickeners and flavor enhancers

Seaweed as food

Diatoms for filters and as

abrasives

Indicators of the general health of the

environment



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