BIOL240 Lecture 22: BIOL 240 - Class 22 Fall 2017
15 Mar 2019
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Document Summary
There are many species in a phylum called proteobacteria: proteobacteria have 5 sub-groups, alpha, beta, gamma, delta, epsilon, zeta smaller group. They have changing phylogeny: commonly encountered bacteria found here. They are related to mitochondria: metabolically diverse, chemolithotrophs, chemoorganotrophs, phototrophs found in most sub groups like alpha, beta. Basically captured light energy but like how plants are green because of chlorophyll, they had a pigment which turned them purple. Species within each group are different in terms of metabolic activity, morphologically also diverse. Many organic carbon loving bacteria are found in proteobacteria. Rickettsia, an intracellular parasite in alpha group is very similar to mitochondria. Phototrophs were first identified in the proteobacteria; they were purple. Purple bacteria make no oxygen during their photosynthesis; anoxygenic. Anoxygenic photosynthesis: photosynthesis is inhibited by o2, although some can grow aerobically, wavelengths determined by specific bacteriochlorophylls and carotenoids, bacteriochlorophyll a, a pigment, is blue.
