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Lecture

Lab 1 - notes.docx

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Department
Biology
Course
BIOL 2030
Professor
German Reyes
Semester
Fall

Description
Lab 1 – Kingdom protista  All life is assigned to 1 of 3 domains : Archaea, Bacteria, Eukarya o Eukarya – 5 kingdom scheme (Plantae, Animalia, Fungi, protista and Monera) o Some scientists feel that Protista need to be further classified o Kingdom Protista is Paraphyletic because it doesn’t include all the descendants of the most common ancestor o Protists are useful because they share ancestory with multicellular animals and have animal like features (heterotrophic, motile)  Protists o Microscopic organisms that contain one to many nuclei o All life processes take place within this single cell; digestion in food vacuoles , water regulation in contractile vacuoles o Reproduction through binary fission o Live in aqueous environments (marine or freshwater) o Some are parasitic, others might be mutualisitic or commensal  Protozoa o Animal-like protists o Classified by their movements  Cilia-small hair-like structures that that surround the body of protists  Flagella- longer than cilia and much fewer in number _____________________________________________________________________________________ Classification of protozoan phyla  Taxonomy of these organisms is dynamic , therefore these classifications may change o Ameobas (sarcodina)- move and feed by pseudopodia  Rhizopodans-locomotion by lobopodia, filapodia(doesn’t rejoin) or cytoplasmic flow .eg. amoeba o Phylum Euglenozoa- movement by flagella  Class euglenoidea- eyespot. Eg. Euglena. Move very slowly. o Phylum Apicomplexa- endoparasites. Most develop a spore(oocyst ) at some point in their life cycle. No structures for locomotion.  Class coccidea- eg.plasmodium (malaria) o Phylum ciliophora- possess cilia. Never amoebid.2 nuclei (macronucleus and micronucleus). Most highly organized protozoa . eg paramecium. Fast moving protozoa 1 Euglena – free living Kingdom :- Protista Phylum:- Euglenozoa Class:- Euglenoidea Order:- Euglenales Genus:- Euglena (E.gracilis/viridis)  Plant- like; may contain chloroplast  Freshwater flagellate  Spindle shaped body  Flagellum anterior; second very short flagellum also aids in locomotion  Movement also carried out by worm like contraction and expansion of body (euglenoid movement)  Flagellum also acts as sensory organ (explorin
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