BSCI 283 Lecture Notes - Lecture 8: Lithotroph, Carbon Fixation, Macromolecule
1 Mar 2017
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Stringent response: decreased cell size, increased cell wall crosslinking, decreased membrane fluidity, etc, change metabolism when resources are restricted, bacteria change expression of genes, physiological, metabolic and physical cues, ex. New microenvironment fluctuation of oxygen levels: ex. Metabolic diversity: organics, inorganics, and light used for catabolism. Intermediates- pmf, nadh, atp: anabolism of intermediates produces proteins, nucleic acids, phospholipids, polysaccharides, bacteria have ability to live anywhere due to diverse metabolism. Heterotrophy and aerobic respiration: glucose etc/tca cycle can reduce anything. In anaerobic environment-reduce other molecule (cid:862)lithotrophy(cid:863: eat (take electrons off molecule) breathe(put electrons on to a molecule, ex. Sulfide oxidation-makes pmf from electron transport, makes atp from f1f0. Atpase: energy excreted from nadh different carriers reduces oxygen, reverse electron transport-consume pmf to go backwards and make nadh needed as cofactor, organism found in hydrothermal vents, ex. Iron oxidation-reverse electron transport used when less energy than nadh: very inefficient but abundant resource. Ecology and niche theory: any combination is possible niche.
