BIOL 1F90 Lecture Notes - Lecture 16: Micrococcus, Peptidoglycan, Gram-Negative Bacteria
12 Jan 2016
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Document Summary
One of the most prominent features of the bacteria and archea is their diversity. Domain archaea and domain bacteria (also called eubacteria) Possess a number of features in common with the eukaryotic nucleus and cytoplasm, suggesting common ancestry (-histones) Membrane linkages different from those in eukaryotes or bacteria (-more resistant to heat and other extreme conditions) Kingdom korarchaeota: primarily known from dna samples of hot springs. Can occupy habitats with very high salt content, acidity, or methane levels, or high temperatures. Hyperthermophile: methanopyrus grows in deep sea thermal vents at 98c. 50 or so are bacterial phyla: structural and metabolic features of half unknown. Some are extremeophiles but many more bacteria favor moderate conditions. 5 major subgroups: alpha proteobacteria, beta proteobacteria, y-proteobacteria, o- proteobacteria, -proteobacteria. Photosynthetic bacteria abundant in fresh waters, oceans and wetlands and on surfaces of arid soils. The only prokaryotes that generate oxygen as a product of photosynthesis. Gave rise to plastids of eukaryotic algae and plants.
