BIOL240 Lecture Notes - Lecture 3: Dna Replication, Great Salt Lake, Ftsz

• School: University of Waterloo
• Department: Biology
• Course: BIOL240
• Professor: Josh Neufeld

Document Summary

Phylogeny: comparisons of rrna gene seq can establish phylogenetic tress, woese a(cid:374)d fo(cid:454) (cid:271)ega(cid:374) these studies i(cid:374) (cid:858)70, o(cid:396)igi(cid:374)all(cid:455) (cid:449)e(cid:396)e (cid:272)alled (cid:862)a(cid:396)(cid:272)hae(cid:271)a(cid:272)te(cid:396)ia(cid:863, first archaeons were methanogens. Origin: archaea and eukarya may have branched off from bacteria, development of histones may have been early branch point event (archaea branch actually closer to eukarya) Morphology & structure: size range is mostly same as bacteria, but not as big as th bacteria, can vary greatly in size, shapes, rods, cocci, spirals. Cell envelope: all archaea possess a plasma membrane, most have a cell wall (thin), most do not have an outer membrane, both structures are diff from their equivalents in the other domains. Has an outer membrane (exception, only archaea with outer membrane) and periplasm similar to arrangements of gram negative cells. Atp synthase enzymes are housed in outer membrane: unusual even for archaea. = network of cells flagella grows from base rather than tip.