EVERYDAY SCIENCE

Detailed explanation-1: -In molecular genetics, a repressor is a DNA-or RNA-binding protein that inhibits the expression of one or more genes by binding to the operator or associated silencers. A DNA-binding repressor blocks the attachment of RNA polymerase to the promoter, thus preventing transcription of the genes into messenger RNA.

Detailed explanation-2: -The repressor binds to the operator gene and prevents it from initiating the synthesis of the protein called for by the operon.

Detailed explanation-3: -Repressor binding blocks RNA polymerase from binding with the promoter, thereby leading to repression of operon gene expression.

Detailed explanation-4: -A repressor is an RNA or DNA binding protein that prevents the expression of genes by attaching to the operator or related silencers. A repressor protein binding to the DNA prevents the RNA polymerase from attaching to the promoter and transcribing the genes into mRNA or messenger RNA.

Detailed explanation-5: -An inactive repressor protein (blue) can become activated by another molecule (red circle). This active repressor can bind to a region near the promoter called an operator (yellow) and thus interfere with RNA polymerase binding to the promoter, effectively preventing transcription.