BIOL 2051 Lecture Notes - Lecture 4: Osmotic Shock, Great Salt Lake, Ignicoccus
Document Summary
Chapter outline: distinctive properties of archaea, archaeal cell structure, diversity of archaea. Distinctive properties of archaea: archaea are prokaryotes: how do we know that archaea is a distinct domain of life? a. i. However, genetic analyses show them to be different a. iii. They live in some of the most inhospitable places (for humans) on earth: phylogeny b. i. Woese and fox began these studies in the 1970s b. iii. The first organisms termed archaeons were the methanogens a group of microbes capable of producing methane b. iv. b. v. Many other groups of archaeons are now recognized, and many grow in very extreme conditions b. v. 1. b. v. 1. a. Chapter 4: archaea: structure (generally speaking) c. i. Usually possess singular, circular chromosome and lack a membrane-bound nucleus c. iii. Dna is complexed with histones (like eukarya) c. iv. Many dna replication enzymes of archaea look like those of eukarya c. v. Plasma membrane structure is unique to this domain.
