Domain Eukaryota

1. Domain Eukaryota Plants, Animals, Fungi and Protista

2. Protista • mainly unicellular eukaryotes. • believed that the other eukaryotic kingdoms evolved from protista. • protists are classified in 3 phyla based on nutrition: • Protozoa • Algae • Slime moulds. • Protists Protozoa Algae Slime mould

3. Eukaryotic Cell Formation • 2hypothesis how evolved from prokayotes • internal organelles (ER, Golgi and nucleus) formed when cell mem. folded in on itself in ancient prokayotes • mitochondria and chloroplast evolved from small prokaryotic cells living symbiotically within larger ones

4. Protozoans – Animal-like Protists • over 30,000 species with a great variety in appearance. • heterotrophic • most are motile • lack cell walls • 3 classes

5. Amoeba (class sarcodines) • feed on small organisms like bacteria, using pseudopods to engulf them. • are able to move using their pseudopods.

6. Trypanosoma(class flagellates) • cause African Sleeping Sickness • move around using a flagellum.

7. Paramecium (class Ciliates) • found in pond water • move around by using cilia (hair-like covering).

8. Algae (Plant-Like Protists) • aquatic, chlorophyll-containing organisms • range in size from single cells to giant seaweeds 60 metres in length. • could almost be classified as plants, except lack leaves, stems, roots. • Algae

9. Brown Algae (Class Phaeophytes) • multicellular • many species can be quite large • ex Kelp

10. Diatoms (class Chryspohytes) • small • unicellular • over 10, 000 species.

11. Red Algae (class Rhodophytes) • multicellular • found in warmer seawater.

12. Slime Moulds and Water Moulds • are similar to fungi (produce spores), plants (have cellulose cell walls) and animals (glide around to ingest food) in some ways. • they generally live off of decaying organic matter.

13. Slime Moulds