Biology 1202B Chapter Notes - Chapter 14: Xist (Gene), Intron, Histone Code

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14. 1 regulation of gene expression in prokaryotic cells. Sugars such as lactose might be more available in the aquatic environment, and genes coding for enzymes needed to metabolize this energy much be turned on. 14. 1a the operon is a unit of transcription. For a typical metabolic process, several genes are involved, and they must be regulated in a coordinated fashion. 14. 1b the lac operon for lactose metabolism is transcribed when an inducer inactivates a repressor. Lac operon: the cluster of genes and adjacent sequences that control their expression - promoter, operator (sequences that control the expression of the operon) & lacz, lacy, laca (transcription unit of three structural genes) Lac operon is controlled by a regulatory protein that they termed the lac repressor - encoded by the regulatory gene laci (nearby but separate from the lac operon) and is synthesized in active form.

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