BIOL240 Lecture Notes - Lecture 3: Inclusion Bodies, Pyrococcus, Cell Membrane
20 Jan 2016
School
Department
Course
Professor
Document Summary
Archaea look like bacteria, didn"t know they existed, genetic analyses show them to be different many life in some of the most inhospitable place. No archaeal human pathogen, some live in/on the human body. Comparisons of rrna gene sequences can establish phylogenetic. Woese and fox began these studies in the 1970s. The first portion termed archaeons were the methanogens a poorly characterized group of microbes capable of producing methane as a byproduct. Many other groups of archaeons are now recognized, and many grow in very extreme conditions. Halobacterium: high concentration of salt, can even grow in salty fodd. Genetic sequence analyses indicate both archaea and eukarya may have branched off from bacteria. Development of histones may have been an early branch point event in the evolution of archaea and eukarya. The unique plasma membrane is also interesting but is not required to thrive in harsh environments. Very similar to bacteria, some can be extremely small.
