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Unformatted text preview: BIO1140 Study Group #8 Answer Key 1. What is gene regulation? Why is it so important to understanding life? Gene regulation refers to the regulation of activity and may occur at any level. While the main control is at the level of transcription additional controls are at the posttranscriptional, translational and posttranslational levels. Regulation of gene expression includes the processes that cells and viruses use to regulate the way that the information in genes is turned into gene products . Although a functional gene product may be an RNA or a protein, the majority of known mechanisms regulate protein coding genes. Any step of the gene's expression may be modulated, from DNA-RNA transcription to the post-translational modiFcation of a protein. Gene regulation is essential for viruses, prokaryotes and eukaryotes as it increases the versatility and adaptability of an organism by allowing the cell to express protein when needed. The Frst discovered example of a gene regulation system was the lac operon, discovered by Jacques Monod, in which protein involved in lactose metabolism are expressed by E. coli only in the presence of lactose and absence of glucose. urthermore, gene regulation drives the processes of cellular differentiation and morphogenesis, leading to the creation of different cell types in multicellular organisms where the different types of cells may possess different gene expression proFles though they all possess the same genome sequence....
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