MICRB265 Lecture Notes - Lecture 5: Periplasm, Carl Woese, Messenger Rna
4 Nov 2017
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Chapter 13 (i, 13. 8, 13. 10): microbial evolution and systematics: the rise of oxygen and the formation of iron oxide bands precipitates. Dissolved and reduced iron in anoxic oceans. fe 0 , fe 2+ . Formed banded iron formations: laminated sedimentary rocks. Respiting oxygen energetically advantageous become of high reduction potential, 2. phylogeny is the evolutionary history of related dna sequences. Carl woese (geoge fox) and the tree of life universal tree of life based on nucleotide sequence similarity in ribosomal rna (rrna). Established presence of 3 domains of life; . Root represents when all life shared the last universal common ancestor (luca). Rna review dominated most of history of life. Trna transfer rna: brings amino acids to ribosomes during translation. Mrna messenger rna: encodes amino acid sequence of a protein. Rrna ribosomal rna: complexes with ribosomal proteins to translate proteins. 5s + 5. 8s + 28s rrna (60s) eukarya. Most common archaea phyla are euryarchaeota and crenarchaeota.
