Lab 3-single celled organisms_BTed2009

Lab 3-single celled organisms_BTed2009 - Lab 3...

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Lab 3 Single-celled Organisms
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Objectives • Describe the characteristics of the three Domains • Differentiate between aerobic, anaerobic and facultative aerobic bacteria. • Describe three vital contributions bacteria make to the global ecosystem. • Differentiate cyanobacteria from other types of bacteria. • Identify two ways bacteria obtain energy. • Describe protistan diversity. • Use distinguishing characteristics to develop a cladogram of representative protistans.
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Taxonomy Domain Kingdom Phylum (animal) or Division (plant) Class Order Family Genus Species
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Three Domains Universal Ancestor Bacteria Archaea Eukarya
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Review: 3 Domains of Life Prokaryotic Domains Prokaryotic Domains – Most Ancient forms of life • Oldest fossils = stromatolites (~3.5 billion years old) Domain Archaea • Many are extremophiles Domain Bacteria • Includes “familiar” bacteria and cyanobacteria Eukaryotic Domains Eukaryotic Domains Domain Eukarya • Includes single-celled eukaryotes, Kingdom Plantae, Kingdom Fungi, & Kingdom Animalia
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Domains Bacteria • Most familiar prokaryotes including most disease- producing bacteria, blue-green bacteria, and benign bacteria living symbiotic relationships with plants and animals Archaea • Prokaryotes that survive in extreme conditions Eukarya • All organisms with membrane bound organelles and nucleus
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Domain Bacteria • Most widespread and abundant organisms on earth
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Bacteria Characteristics Prokaryotes - No true nucleus - No membrane- bound organelles Unicellular Facultative anaerobes - prefer atmoshperic oxygen but can survive without it Aerobic – require oxygen Anaerobic – cannot tolerate atmospheric oxygen
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How do they obtain energy?? • Heterotrophs – Break down complex organic compounds gleaned from the environment – Fermentation or cellular respiration • Autotrophs – Fix carbon dioxide to make their own food – Photoautotrophic: fueled by light energy – Chemoautotrophic: oxidation of nitrogen, sulfur, or other elements
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Bacteria Morphology Coccus Bacillus Spirillum
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Ecological Importance of Bacteria Bacteria are the most Bacteria are the most numerous and widely numerous and widely distributed organisms distributed organisms on Earth! on Earth! Human Health Issues Human Health Issues – Pathogenic bacteria • Antibiotic production • Antibiotic resistance – Symbiotic bacteria • Aid digestion – Food production • Dairy foods – Genetic Engineering Decomposition Decomposition – Sewage – Toxic spills
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Ecological Importance of Bacteria Nutrient Cycles Nutrient Cycles – Carbon Cycle • Decomposition • Respiration – Oxygen Cycle • Photosynthesis and Respiration – Nitrogen Cycle • Nitrogen fixation – Why is useable nitrogen important to organisms?
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Lab 3-single celled organisms_BTed2009 - Lab 3...

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