Protist notes

Kingdom Protista -Kingdom at the crossroads-

Classification
Free-living
Eukaryotic
unicellular, colonial forms
3 types
Animal like
Plant like
Fungus like
Most easily classified by what they are NOT
Not animals, not plants, not fungi

Animal-like protists “Protozoans”
Unicellular & colonial
Eukaryotic
heterotrophic
Endosymbiont Hypothesis
First eukaryotic cell was formed by a symbiosis among several prokaryotes which lost the ability to live alone

Animal-like protists
Ciliates - motile, cilia, free living
Ex. Paramecium (reproduction by binary fission, conjugation)
b. Flagellates – motile, flagella, reproduce asexually by binary fission and sexually
Ex. Trypanosoma – causes African sleeping sickness
Ex. Trichonympha – live in termites, help digest food
c. Sporozoans – non motile, parasitic, reproduce by spores
Ex. Plasmodium – causes malaria
d. Sarcodina – “false feet” pseudopods
Ex. Ameba – some cause amebic dysentary
**Disease – infection caused by many of these**

Ameoba

Paramecium

Radiolarian

Plant-like protists
Single celled
Photosynthetic
Some are flagellated, luminescent
May live freely or as colonies
Phytoplankton – primary producers of oxygen

Euglenophyta - Euglena (autotrophic and heterotrophic)
Pyrrophyta – dinoflagellates (luminescent, produce toxins that shellfish absorb – dangerous = RED TIDE)
Chrysophyta – diatoms, important component of marine plankton – food source for marine animals, silicon cell walls important component of detergents, polishes, paint removers

Diatoms

Spyrogyra

Fungus-like protists
Contain parasitic and predatory molds that produce spores
Most are single-celled, decomposers in aquatic habitats
Phagocytic slime molds live as single amoeboid cells or aggregations of cells that migrate together and form spore producing structures

Acellular slime molds – help scientists study movement of protoplasm, form plasmodia at one point in life cycle
Cellular slime molds – help scientists study how cells communicate, function like a single, multicelled organism as one point in their life cycle

Slime mold

ALGAE Protists or Plants???
Red, Brown and Green Algae
Many scientists place them in Plant Kingdom

Protist notes

by mrskennedy on Jan 10, 2007

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