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Unit 6 – Lecture 1
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Recall Classification Organisms are classified by: cell type body type how they attain nutrition genetic composition
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Domains There are three domains of Life: Bacteria Archaea Eukarya
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Domain: Bacteria Kingdom Eubacteria prokaryotic unicellular
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Domain: Bacteria Kingdom Eubacteria asexual reproduction sometimes with conjugation using pili [sing = pilus]
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Domain: Bacteria Kingdom Eubacteria strong cell wall can be autotroph or heterotroph saphrophyte parasite chemoautotroph photoautotroph
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Domain: Bacteria Kingdom Eubacteria found almost everywhere except for extreme environments some have locomotion flagella cilia
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Domain: Bacteria Kingdom Eubacteria three basic body shapes: bacillus coccus spirillum strep = chains staph = clusters
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Domain: Archaea Kingdom Archaebacteria prokaryotic unicellular asexual reproduction sometimes with conjugation
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Domain: Archaea Kingdom Archaebacteria strong cell wall with unique composition autotrophic photoautotroph chemoautotroph
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Domain: Archaea Kingdom Archaebacteria closer genetically to eukaryotes than eubacteria live in extreme environments high heat, high salt
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Domain: Eukarya Kingdoms Protista, Fungi, Animalia, Plantae very diverse but all are eukaryotic unicellular or multicellular highly organized sexual or asexual reproduction
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Recall – Characteristics of Life organized into cells reproduces can pass traits to offspring grows/develops needs energy maintains homeostasis responds to stimuli
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Viruses Living or not? Up for debate. Multiple forms: helix icosahedral bacteriophage and more
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Viruses Bacteriophage anatomy capsid [head] neck nucleic acid tail / sheath tail fibers
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Viruses Reproduction must occur in a host cell two cycles: lytic cycle lysogenic cycle
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Viruses Lytic Cycle infection DNA is incorporated viral DNA uses host to replicate DNA and make more viruses destruction
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Viruses Lysogenic Cycle infection incorporation of DNA DNA is dormant & replicates with cell info during cell cycle
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Viruses Prion – “evil misshapen protein” responsible for mad cow disease which destroys brain tissue recent discoveries, however, show that “normal” prions may have an important role in keeping nerve cells healthy
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Viruses Uses for viruses vaccines gene therapy
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Recall – Characteristics of Life organized into cells reproduces can pass traits to offspring grows/develops needs energy maintains homeostasis responds to stimuli
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