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Protists The first Eukaryotes.

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Presentation on theme: "Protists The first Eukaryotes."— Presentation transcript:

1 Protists The first Eukaryotes

2 Protist Characteristics
1) Domain: Eukarya (have a nucleus) 2) Most are unicellular 3) None have true tissues (so not plant, animal or fungi) 4) Animal-like, Plant-like or Fungus-like

3 Animal like Protists Called Protozoans Heterotrophs
Lack cell walls and chloroplasts Can be grouped by locomotion

4 Locomotion of Animal-like Protists
1) ciliates: move by cilia 2) amoebozoans (sarcodina): move by pseudopods 3) flagellates (zoomastigina): move by flagella 4) apicomplexans: non-motile (parasites)

5 Ciliates All have many short hair-like cilia Paramecium sp.

6 A) contractile vacuole B) food vacuole C) macronucleus D) micronucleus
E) pellicle F) cilia G) oral groove H) gullet G H

7 Paramecium

8 In your jar….

9 Amoebozoans Move by flowing cytoplasm into projections of cell membrane called pseudopods false feet Example: Amoeba Not in ecojars

10 Amoeba Structures to know
A) nucleus B) contractile vacuole C) food vacuole D) pseudopod B C A D

11 amoeba http://www.youtube.com/watch?v=pvOz4V699gk

12 Animal-like Flagellates
Move with few long hair-like structures No chloroplasts Trypanosoma sp. cause sleeping sickness Tsetse fly vector

13 Giardia…..hiker’s diarrhea

14 Apicomplexans All are Parasites Don’t move on their own
Are carried by a vector Plasmodium sp. cause Malaria live inside human Red Blood Cells

15 Plant-like Protists Are photosynthetic & have chloroplasts
May have accessory pigments that make them red, brown, or gold Unicellular types called phytoplankton plant floater Some are multicellular but lack tissues May have flagella

16 Euglenophyta Can do photosynthesis and act as heterotroph
Green but lack cell wall Move with flagella Spinning motion Eyespot detects light

17 Euglena A) flagella B) eyespot C) chloroplast D) nucleus
E) contractile vacuole A B E C D

18 Euglena http://www.youtube.com/watch?v=jl0TzaWUQWk

19 Diatoms Golden-yellow Algae Unicellular 2 silica shells
Important in phytoplankton food chain Move by squirting out water Diatomaceous earth

20 Dinoflagellates Some have armor-like plates Others are bioluminescent
Dinoflagellate blooms: Caused by high N +P level May result in Red tide May result in Eutrophication p127

21 Chlorophyta Green algae (chlorophyll) Most similar to plants
Unicellular …Desmids Multicellular…filamentous algae & volvox

22 Brown Algae Brown pigments absorb wavelengths of light that reach deeper into the water. Largest multicellular algae Sargassum kelp 

23 Sargasso Sea

24 Red Algae Red pigments absorb wavelengths of light even deeper in the water. (green & blue) Used to make thickeners & agar Multicellular

25 Fungus-like Protists Water molds Slime molds
Major decomposers in forests and ponds


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