MICR 2123 Lecture Notes - Lecture 13: Rocky Mountain Spotted Fever, Facultative Anaerobic Organism, Gram Staining

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Chapters 18-20: diversity bacterial, archaeal, and eukaryal. A bacterial phylum is a group of bacteria sharing a common ancestor that diverged early from other bacteria. Well-studied bacterial phyla include: deep-branching thermophiles, cyanobacteria, gram-positive bacteria, gram-negative bacteria, bacteroidetes and chlorobi, spirochetes, chlamydiae and planctomyces. Contain chlorophyll and accessory pigments like those found in chloroplasts. Fix co2 using calvin cycle in carboxysomes. Many fix n2 in specialized cells: heterocysts. Comprise two distinct phylogenetic branches: phylum firmicutes. Both groups have thick cell walls that retain the gram stain: crystal violet. Obligate anaerobe: vegetative cells develop inert endospores in times of starvation and stress, released spores germinate in favorable conditions, and then restart vegetative growth. Can be identified by the acid-fast stain due to the presence of mycolic acid in their cell walls: mycelial actinobactera. Proteobacteria consist of five major classes: , (cid:533), (cid:534), (cid:303), and (cid:304, all share a common structure their triple-layered gram-negative cell envelope. Cell membrane: have a diverse metabolism (a).

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