BIOL 1003 Lecture Notes - Lecture 7: Plasmogamy, Rna Interference, Chromatin
20 Dec 2016
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Biol 1003- exam review: week of sept. 9 oct. 3. 5, 6, 7, 8, 9 (midterm 1: week of oct. 10 nov. 7. 10, 12, 16, 17 (midterm 2: week of nov. 14 dec 5. Prokaryotes and eukaryotes alter gene expression in response to changing environment. Gene expression is controlled through transcriptional regulation. In multicellular eukaryotes, all somatic cells in an organism are genetically identical. Gene expression regulates development and is responsible for differences in cell types. Rna molecules play many roles in regulation eukaryotic gene expression. Prokaryotic gene expression reflects their life history. Natural selection favours bacteria producing only products needed by that cell. Therefore, bacteria must be able to respond rapidly and reversibly to their environment. Operon: a cluster of prokaryotic genes and dna sequences involved in their regulation. Rna polymerase binds at promoter for the entire operon. Many genes may be transcribed as a transcription unit in polycistronic mrna.
