BIO152H5 Chapter Notes - Chapter 28: Nitrogen Fixation, Microbiological Culture, Nitrogen Cycle
Document Summary
10 trillion (1013) cells in body. 1012 bacterial cells on skin, 1014 bacterial and archaeal cells in stomach and intestines. Soil is very abundant in bacteria and archae cells. Group 1 (marine archae) may be the most successful organism. Total number of bacteria and archae alive today approx. Yes; spin like bacterial flagella, but distinctive in molecular composition. Yes; undulate back and forth and have completely different molecular composition compared with bacteria and archae. Almost all contain peptidoglycan which contains muramic acid. Rna polymerase; translation begins with formylmethionine; translation poisoned with several antibiotics. Glycerol bonded to branches fatty acids (synthesized from isoprene subunits) via ester linkage. Varies widely among species but no peptidoglycan and muramic acid. Glycerol bonded to straight-chain fatty acids via ester linkage. When present, usually made of cellulose or chitin. Several relatively complex rna polymerases; translation begins with methionine that do not affect archae or eukaryotes.
