1. Protista

2. In General Usually unicellular
Reproduction: Some asexual, some sexual, some both
Kingdom for life that doesn’t fit in animals, plant or fungi kingdom
Mostly aquatic life
3 main categories

3. Animal-Like Protista AKA: Protozoans Basic Features:
Aquatic, unicellular
Heterotrophic: pathogens, parasites, predators
Classified by how they move:
1) Pseudopods : move w/ pseudopodia (false- feet)
Engulf by phagocytosis
Ex: Amoebas
2) Flagellates: move w/ flagella
Ex: Zooflagellates
3) Ciliates: move w/ cilia
Ex: Paramecia

4. Amoeba (Pseudopod)

5. Flagellate Moving

6. Ciliate Moving

7. Animal-Like Protista & Disease
Malaria
Caused by: Plasmodium
Vector: Mosquitoes
Effects in humans: Fatigue, fever, vomiting, coma, death
Sleeping sickness
Caused by: Trypanosoma
Vector: Tsetse flies
Effects in humans: Coma & death

8. Plant-like Protista AKA: Algae
Most unicellular; No leaves, stems, roots
Perform photosynthesis with chloroplasts
Classified by their type of cell wall
1) Euglenoids: use flagella to swim
Animal & plant-like
2) Dinoflagellates
Most (~ 90%) plankton
Basis of aquatic food chains
3) Diatoms
Glasslike shells
Provide ~ ½ the O2 on earth
Green algae
Red algae
Brown algae

9. Euglena

10. Fungus-like Protista Basic Features: 2 major groups: 1) Slime Molds
Decomposers: Absorb and recycle nutrients
Live in moist environments
2 major groups:
1) Slime Molds
large (~1 meter) single celled mass of cytoplasm
Fungus-like (absorbs food)
Animal-like (can move)
2) Water molds: Can be parasitic
Ex: Potato blight: caused Irish potato famine (1840’s)

11. Cool Slime Mold Video

12. Origins of Multicellularity
Protista live in 3 arrangements…
1) Single-celled
Live by themselves
2) Colonial
Group of independent acting cells
No specialized cells
3) Multicellular
Cells specialized to be specific jobs
Importance:
Cells in colonies became efficient at certain tasks.
Cells & their offspring became specialized and dependent on each other.
= ANCESTORS OF MULTICELLULAR LIFE
This is a colony of cells called Volvox
Unicellular Euglena
Multicellular Kelp

13. And lastly (if you couldn’t tell already)… Protists are difficult to classify
Protista is one kingdom in the domain Eukarya.
Some protists are not closely related.
Molecular evidence supports reclassification.
Protista classification will likely change.

14. REview 1) Name the three categories of protista.
2) Which category of protista has members that are able to move?
3) Which category of protista has members that absorb nutrients?
4) Which category of protista has members that are heterotrophs?
5) Which category of protista has members that hunt?
6) How does a pseudopod, flagella, and cilia differ?
7) Name the 3 major categories of protozoa.
8) Name the 3 major categories of algae.
9) Name the 2 major categories of fungus-like protista.