LSCI 204 Lecture Notes - Lecture 18: Permease, Transfer Rna, Cell Membrane
8 Feb 2018
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Document Summary
The regulation of gene expression is critical for all organisms. Regulatory genes: encoding products that interact with other sequences and affect the transcription and translation of these sequences. Regulatory elements: dna sequences that are not transcribed but play a role in regulating other nucleotide sequences. Constitutive expression: continuously expressed under normal cellular conditions. Dna-binding proteins can be grouped into several types based on their structures, or motifs. Negative and positive control: inducible and repressible operons lac mutations. Operon: promoter + additional sequences that control transcription (operator) + structure genes. Regulator gene: dna sequence encoding products that affect the operon function, but are not part of the operon. An operon is a single transcriptional unit that includes a series of structural genes, a promoter, and an operator. At one end of the operon is a set of structural genes as gene a, gene b, and gene c: are transcribed into a single mrna, translated to produce enzymes a, b, and c.
