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Week 5 Notes

by: Chris Fong

Week 5 Notes Bio 1

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Chris Fong

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About this Document

Continuing from Week 4 concepts of the origin of life, phylogeny, and early organisms.
Contemporary Biology
Dr. Laura Beaster Jones
Class Notes
Biology, origins of life
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This 2 page Class Notes was uploaded by Chris Fong on Monday February 29, 2016. The Class Notes belongs to Bio 1 at a university taught by Dr. Laura Beaster Jones in Spring 2016. Since its upload, it has received 20 views.


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Date Created: 02/29/16
Protists    What is a Protist?  ● Not plants, animals, or fungi  ● Eukaryotes ­> they have membrane bound organelles  ● Live in moist, wet habitats  ● Are often microscopic  ● Photosynthetic, parasites, predators, filterer, decomposer  ● Single or multicellular  ● Autotroph or Heterotroph  ● Existed approximately 2.2 BYA    Time Periods    Hadeon Eon  ● Earth first forms  ● Earth is not currently able to sustain life  ● No organisms    Archaean Eon  ● 1st Prokaryotic fossils are discovered (Approximately 3.8­3.5 BYA)  ● Organisms are mainly bacteria and archaea; this is because the initial  atmosphere of earth lacked oxygen  ● Cyanobacteia are the first oxygenic photosynthesizers    Proterozoic Eon  ● 1st Eukaryotic fossils are discovered (Approximately 1.8 BYA)  ● First instance of endosymbiosis theory  ● 1st multicellular fossils discovered    Historical Categories for Protists  1. Ecological: Algae, Protozoa, fungus  2. Mobility: Flagella, Cilia, Amoeba  3. Habitat Size: Plankton, Periphytic, Seaweed    Classifications of Protists  1. Alveolata: Ciliates, Dinoflagellates, Apicomplexa  2. Stramenopila: All reproductive cells that have “hairy” flagella  3. Rhizaria: Filose Pseudopodium (Hairlike extensions)  4. Amoebozoa: Amoeboid movement  5. Opisthokonta: Single posterior flagellum 


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