Lecture 8 - prokaryotes1 - III. Reproduction A. Binary...

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Lecture Outline 8 – Prokaryotes I. What are prokaryotes? A. 2 of 3 domains (archaea and bacteria) B. Unifying traits (see table 27.2) - no membrane / organelles - no mitosis / meiosis - often flagellated - unicellular C. 3 basic morphologies (spherical, rod, spiral) D. Archaea versus Bacteria - peptidoglycan wall (bacteria only) - RNA polymerase ( bacteria has only one type ) - introns ( archaea only ) - Histones ( archaea only ) - pathogenicity ( bacteria only ) - antibiotic susceptibility ( bacteria only ) - extreme environments ( archaea only ) II. Structure - DNA usually single circular chromosome found in nucleoid - Plasmid – DNA molecule separate from chromosome - Flagellum – provides locomotion - Capsule – provide protection from: viruses, phagocytes, desiccation, etc - cell wall – provides protection, structure and support - Fimbriae – attachment filaments - Peptidoglycan (bacteria) and lipolysaccharides (gram - bacteria)
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Unformatted text preview: III. Reproduction A. Binary Fission B. Genetic recombination 1. Transformation uptake of foreign DNA 2. Transduction Horizontal gene transfer btw bacteria via phage virus 3. Conjugation one way transfer of genes (plasmid or chromosome); F factor needed for pilus formation IV. Metabolism A. Nutritional modes (Autotrophs [photo or chemo] and heterotrophs [photohetero and chemohetero]) B. relationships to oxygen C. relationships to nitrogen-heterocyte specialized cell for nitrogen fixation V. Ecosystem A. Recyclers -decomposers, N2 fixation B. Symbiosis living in close association w/ other organisms (e.g. mutualism, commensalism, and parasitism) C. Pathogenesis (exotoxins and endotoxins) D. Bioremediation removal of pollutants using prokaryotes VI. Antibiotic Misuse and bacterial resistance...
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