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Gene expression is a process by which a gene is converted into a particular protein.
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The processes that ensure the conversion of a gene to the required protein is called as gene expression.
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In other words, the expression of gene produces a protein.
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So this process is controlled by several mechanisms in each other.
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Prokaryotes and eukaryotes in eukaryotes the methods of regulation for gene expression are epigenetic second one being transcriptional regulation and translational regulation so let us consider the transcriptional regulation for example the transcriptional regulation works in such a way there is a cell there is a nucleic acid so there is a receptor for example a growth hormone binds to this receptor and enters inside the cell so it enters inside the cell this receptor sorry this growth hormone growth hormone can be written as g h this growth hormone activates certain factors called as transcription factors.
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These transcription factors in turn initiate or activate the process of transcription.
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The transcription process converts dna into messenger rna strands just mrna.
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So this type of regulation of gene expression is called as transcriptional regulation of gene expression.
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Here the dna is converted to mrna.
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In other circumstance when an undesirable factor, sorry for example protein x enters the cell and the protein x inhibits the ongoing transcription when it inhibits these are called as regressors...