Lecture 2

Lecture 2 - Lecture 2 Ch. 24 Protists: Unicelllar simple...

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Lecture 2 Ch. 24 Protists: Unicelllar simple multi-cellular organisms having a eukaryotic cell organization First the Eukaryotes that evolved! Members of the Domain Eukarya Means of Locomotion- Pushing out cytoplasmic extensions ( pseudopodia) as an amoeba does, flexing individual cells, gliding over surfaces, waving cilia and flagella. Methods of Obtaining nutrients- Differ among kingdom Protista. Most algae are autotrophic and photosynthesize as plants do. Some heterotrophic protests obtain food through absorption, as fungi do, … Resemble animals in that they ingest food o Some protists can switch their modes of nutrition and are autotrophic and heterotrophic at other times Some protests have symbionic relationships with other unrelated organisms. 1. Mutualism- a. A more or less equal partnership where both partners benefit 2. commensalisms a. Where one partner benefits and the other is unaffected 3. parasitism a. Where one partner (the parasite) lives on or in another (host) and metabolically depends on it. Most protests make up the Plankton in Water environments. Many reproduce asexually and many also reproduce sexually (through syngamy- fusion of gametes) 1.5 to 1.6 bya- first eukaryotic cells to evolve from ancestral prokaryotes Zooflagellates - heterotrophic unicellular protests with flagella Chlamydomonas – a unicellular protest – motile organism with two flagella and a cup-shaped
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Lecture 2 - Lecture 2 Ch. 24 Protists: Unicelllar simple...

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