BIOL 1500 Lecture Notes - Lecture 15: Nitrogen Fixation, Obligate Aerobe, Spirillum
6 Oct 2016
School
Department
Course
Professor
Document Summary
Bacteria and archaea belonging to distinct domains. The nucleoid is the region where dna resides. Plasmids are the circles of dna apart from the chromosome. Ribosomes use mrna a to synthesize proteins. The cell well gives the cell its shape. The 3 most common shapes are coccus (spherical), bacillus (rod-shaped), and spirillum (spiral) There are 52 known phyla of bacteria, but it is estimated there may be over 1000 phyla. It is estimated that there are anywhere from 10 million to 1 billion different species of bacteria. It is estimated to be 1030 bacteria are on earth. Escherichia. coli and salmonella (animal feces, food poisoning) Cynobacteria (autotroph, green color, first to release oxygen to the atmosphere) It is estimated that there are 18-23 different archaea phyla. Often collectively called extremophiles since they survive in extreme habitats (lack of oxygen, hot, acidic, or salty) Bacteria and archaea are essential to all life.
