BSC 116 Lecture Notes - Lecture 4: Great Salt Lake, Pilus, Facultative Anaerobic Organism
26 Sep 2017
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More on biology and diversity of proks. Protists are a non-monophyletic group of single- or multi-celled euks. Recombination = sex: creates new genotypes. Transformation: can pick up dna from environment. Horizontal gene transfer: movement of genes from one species to another: syncytin in humans and other mammals. Conjugation: one-way transfer of dna: donor and receiver connected by sex pilus ( mating bridge , donation and pilus formation requires f factor (f = fertility) F plasmids: plasmid passed: f+ plasmid to f- via pilus, carries plasmid genes and f factor. Hfr cell: f factor on chromosome: high frequency recombination (hfr, chromosome passed and recombined. E. coli video represented evolution: evolution descent with modification or the idea that present day organisms are different from their ancestors. Some of the e. coli developed a mutation (or already had it) for antibiotic resistance these are usually on plasmids called r plasmids. Proks can use various energy and carbon sources.
