GEOL 1425 1st Edition Lecture 13Outline of Last LectureI. EcosystemII. Consumers/producersIII. metabolismOutline of Current Lecture I. Different MicroorganismsII. Microorganisms and their environments Current Lecture- The universal ancestor gave rise to the three major domains of life: Bacteria, Achaea, and Eukaryotes. - Eukaryotes have a more complex cellular structure, which include a cell nucleus that contains genes. - Eukaryotes are the youngest of the three domains of life.- Microfossils: the traces of individual microorganisms preserved in rocks. - Microorganisms that live in extreme environments are almost exclusively archae and bacteria.- This is backed up as some of the names of these microorganisms might suggest: halobacterium (halite, salt) , thermococcus (hot) , methanopyrus (methane gas), acidophile (acid), anaerobe (no oxygen). - Extremophiles are microorganisms that live in environments that would kill other organisms. - Some of these extremophiles use nitric acid, sulfuric acid, iron, arsenic, or uranium for respiration. - Microorganisms can precipitate minerals in two distinct ways: indirectly/ directly.- Indirectly: influencing the composition of the water surrounding them.- Directly: in their cells as a result of their metabolisms. - Some microorganisms extract iron from minerals nearby called dissolutionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Microbial mats are layered microbial communities. Common in hypersaline lagoons, tidal flats, and hot springs. - Stromatolites: rocks with distinctive thin
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