Lecture 2(new)(done) - Lecture 2 PROTISTS & FUNGI...

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Lecture 2
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Learning Objectives: To define protists To describe the characteristics, features and the diversity of protists. To briefly discuss the association of protists with the evolution of higher organisms.
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Learning Outcomes Upon successful completion of the lecture, students will be able to: Explain the characteristics of protists of their nutritional requirements, metabolic patterns, and classifications. Relate the habitat in which protists can be found with the metabolic pattern Relate the protists with the evolution of higher organisms.
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Protists
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Protists Simplest eukaryotes Most likely to be the first eukaryotic cells . Have organelles. Ribosomes larger than prokaryotes. Have more than one chromosome, each with DNA and proteins attached. Use microtubules in a cytoskeleton, in spindles that move chromosomes, in 9+2 flagella or cilia. Divide via mitosis , meiosis or both.
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The Evolutionary History Protists represent the ‘crossroads’ between prokaryotes and higher forms of life A distinct group on its own. Some of the ancients ones evolved to form the higher organisms
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The Divisions of Protists Evolutionarily ancient flagellates Shelled Amoebas Alveolates Stramenophiles Brown Algae Green Algae Red Algae
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Evolutionarily Ancient Flagellates
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Flagellated protozoans 1. Euglenoids 2. 3. Typanosomes
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Flagellated protozoans Single-celled heterotrophs with one/ more flagella and a pellicle. Pellicle – imparts shape to the cell. Free-living ones are found in fresh water & marine habitats Parasites – moist plant & animal (human) tissues
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Examples of flagellated protozoans Giardia lamblia Trichomonas vaginalis Trypanosoma brucei
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may be a representative of one of the first eukaryotic lineages. Lack mitochondria and lysosomes. Forms cysts
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Lecture 2(new)(done) - Lecture 2 PROTISTS & FUNGI...

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