BIOS 101 Lecture 15: prokaryotes
Document Summary
Archaea (domain archaea: characteristics i. ii. iii. iv. Do not possess membrane bound organelles and possess a cell wall lying outside the cell membrane. Often live in extreme environment (acid hot springs, high saline thermal vents in ocean: yellowstone national park v. Certain species called methanogens: live in anaerobic habitats, ex: mud in swamps, digestive tracts, produces ch4 as byproduct of their metabolism= major source of methane in atmosphere vi. vii. Archaea differ from true bacteria in cell wall and cell membrane composition and other molecular features. Archaea more closely related to domain eukarya than to domain bacteria: true bacteria (domain bacteria, characteristics i. As characteristics of all prokaryotic organisms, true bacteria have no membrane bound organelles and possess a cell wall which lies outside the cell membrane. Generally small (1-10 um) ii: most are heterotrophs; some are photoautotrophs or chemoautotrophs, bacteria shape, structure of a typical bacillus true bacterium i.
