ACCT 2000 Chapter : Chapter 11 Student
Document Summary
Archaeal traits and diversity: widest temperature range. Ph 0, high pressure, anaerobic: unique biochemistry. 4 phyla of archaea- (2 major, 2 minor) Hyperthermophiles (require really high temperatures for growth) Require at least 9% nacl for growth (most require 12-23%) Common in salt lakes and salterns (ponds used to prepare solar salt by evaporation of sea water) To prevent water loss in hypertonic environment: pump inorganic ions (k+) into the cell, make or concentrate an organic solute in cell. Some extreme halophiles use light to produce energy. Light-mediated energy production: don"t have chlorophyll, have protein called bacteriorhodopsin (red color, atpase uses this gradient to form atp. Light energy is used to pump protons to outside surface of cell membrane and generate a h+ or na+ gradient. Release 100 million tons of methane into atmosphere each year. Freshwater sediments rice paddies, marshes, etc: gastrointestinal tract of animals human large instestine. Rumen 10-20% of total methane emitted to atmosphere originates in rumen.
