BIOL120 Lecture Notes - Transmission Electron Microscopy, Scanning Electron Microscope, Lynn Margulis
15 Apr 2013
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Microscopes: 1km-200mm = unaided eye, 100mm-50 m = light microscope, 50 m-1nm = electron microscope, scanning electron microscope, transmission electron microscope. Endosymbiotic theory: developed by lynn margulis, 1970"s: postulates that several key organelles of eukaryotes originated as symbioses between separate single-celled organisms. According to this theory, mitochondria and plastids (e. g. chloroplasts)--and possibly other organelles--represent formerly free-living bacteria that were taken inside another cell as an endosymbiont: molecular and biochemical evidence suggest the mitochondrion developed from proteobacteria (in particular, rickettsiales, the. Sar11 clade,[1][2] or close relatives) and the chloroplast from cyanobacteria: this theory is supported by the fact that some organelles have. Chromosomal dna configured much like that of bacteria, ie, the loop chromosome/dna in chloroplasts ie, the 16s ribosomal rna of the mitochondria, more similar to bacterial rna than that found in the cell nucleus. Similarities: prokaryotes and eukaryotes: have similar metabolic processes, both cell types produce macromolecules, they utilize 4 types of macromolecules, nucleic acids:
