BIOL 2303 Lecture Notes - Lecture 9: Gut Flora, Actinobacteria, Gram-Positive Bacteria
18 Apr 2018
School
Department
Course
Professor
Document Summary
The study of the evolutionary history of life: name and describe organisms. Infer relationship between organisms: understand adaptations of organism to their environments. Conservation- to conserve organisms, need to know what is there. Diagnostics- to identify a pathogen, need criteria. Phylogeny: evolutionary relationships (cid:271)et(cid:449)een indi(cid:448)iduals, spe(cid:272)ies , genera, et(cid:272) . We can infer a phylogeny using different kinds of data: morphology, sequence data (most useful for microbes) Domain: the three oldest groups of organism- archaea, bacteria, eukarya. A species consists of populations or organism that can reproduce with one another and that are reproductively isolated from other such populations. Asexual reproduction (binary fission) means that reproduction isolation cannot be criterion for delimiting a species. Proteobacteria: gram negative, metabolically diverse, chemolithotrophs, chemoorganotrophs, phototrophs, anaerobic, microaerophilic, range of cell shapes, many important bacteria, pathogens, six classes, alpha, beta, gamma, delta, epsilon, zeta. Bacteroidetes: gram negative, less than 700 species, major component of the human gut microbiota.
