Cell Tissue Gene DNA Mitosis Meiosis
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Cell Tissue Gene DNA Mitosis Meiosis |
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  10:17 | 0 Cloud(s) Lac Operon
Operon and Gene Regulation :
*Operon are multiple genes that part of a single gene expression unit
*Lac operon : the protein necessary for the utilization of lactose
Absence of Lactose
*Repressor protein bind to the operator site
*Blocking the promoter site
*Prevent RNA polymerase from binding to the promoter site
*Prevent transcribing the structural genes.
*The structural genes that code for the enzyme needed to digest lactose are not transcribed
*No production of lactose digested enzymes
Persence of Lactose
*Lactose convert to allolactose and bind to the repressor
*Changing repressor shape so that it is inactive and cannot bind to the operator
*RNA polymerase bind to promoter
*The structural genes are transcribed into mRNA that later translated into enzymes that digest lactose
Animation : Lac Operon Process
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