Biology 1002B Lecture Notes - Lecture 15: Lac Operon, Mutation, Repressor
12 Apr 2017
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Document Summary
Several ways that bacteria terminate transcription: only one talked about is hairpin. A release factor (rf) binds to the termination codon in the a site. Uac (5" to 3") as it appears in the mrna, read 5"-3". Some amino acids have multiple codons- redundancy: mutation may not change aa sequence. Parts: green= promoter, yellow= sd box (docking sequence, dark green= start codon, blue= regular codons specifying amino acid sequence, red= stop codon, pink= terminator sequence. All the info is coded in dna, but which kinds of info are actually read as dna: terminator sequences are present in dna. Understood by the cell as rna form (that"s when they do their job, to stop transcription: stop codons are present in dna but they do their job as mrna. Recognized by termination factors as mrna: codons are understood as mrna, start codons are understood as mrna, sd box understood as mrna, only promoters are read as dna.
