MMG301 1nd Edition Lecture 9Outline of Last Lecture I. PhotosynthesisOutline of Current Lecture II. ArchaeaCurrent Lecture-archaea-two major phyla-1. Crenarchaeota: hyperthermophilic and cold-dwelling organisms-2. Euryarchaeota: hyperthermophiles, extreme halophiles, and methanogens-can live in very diverse environments-strict anaerobes to strict aerobes-all soil and water habitats-can live with or in plants or animals-can endure all temperatures-can endure high salt concentrations-the discovery of archaea-Alessandro Volta: 1776; bubbles from agitated lake bottoms are flammable-Carl Woese: 1970’s; 16s rRNA sequences show 3 domains of life; first to document archaea; finding wasn’t recognized as fact until about 10 years later; at the time he was criticized -archaea can get their energy from…-chemolithotrophsThese 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.-chemoorganotrophs-methanogenesis-phototrophs-archaea have ether lipids, compared to ester lipids in bacteria and eukaryotes-they can also form lipid monolayers (hyperthermophiles do), compared to lipid bilayers in bacteria and eukaryotes-note: bacteria can also form monolayers, but they are not branched like the monolayers of archaea-stabilization of their DNA-high salt and compatible solute concentrations-reverse DNA gyrase-DNA-binding proteins wind DNA into compact structures-methanogenesis-strictly anaerobic process-produces methane-H2 is the electron donor-Na+ motive pump for ATP
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