REGULATION OF GENE EXPRESSION AND THE DIFFERENCES BETWEEN EUKARYOTES AND PROKARYOTES IN THIS PROCESS
Every day in our body and each cell there are a wide range of mechanisms that helps the cell to survive and also helps the organisms to survive as well. The part of these mechanisms is increasing and decreasing the production of specific gene products (either proteins or RNA), and is known as gene regulation. Moreover this process is happening in both eukaryotes and prokaryotes, but there are some differences between them. This essay would firstly, focus on the process of gene expression and control (regulation) of that, secondly the differences between the prokaryotes and eukaryotes in this in regulation of gene expression.
Definition
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Transcribtion factors also can prevent the transcribtion of a gene. Once is analayzed the signals to the cell, then there would be the cell desicioun whether it needs to stop or run more of gene production; in this situation cell would send another transcription factors that over expresses the gene. In addition, these transcription factors are binding to the promoter and by blocking the access to the gene, they prevent the binding between RNA polymerase and the gene, therefore the mRNA could not be made; also these transcription factors that are blocking the access of RNA polymerase and the gene called repressors.
Prokaryotaes and the operon model
The operon concept has been introduced by jacob and monad in 1961 and it explains the mechanism of gene regulation. In prokaryotes the genetic activity is controlled by an specific protein; also this fact is very variable on environmental factors. This protein intract with the organism DNA to rapidly adjust to the environmental changes. This defult setting would allow to contionual synthesis of protein to appear, nonetheless in eukaryotes the system is normally off until
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An operons consist of specific segment of genes that are regulators of protein synthesis; on the other hand, an operon cannot code for protein, and its called operator and promoter. In addition these segments overlap and the interaction of operons would detemine whethere the process should start or stop. Moreover the interaction between the operone and DNA would prevent the connection between RNA polymerase and chromosome, which prevents the process of