Discuss the genetic control of enzyme activity with the help of operon model.
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Control of enzyme activity or enzyme secretion is needed in order to control the normal body growth and metabolism. One of the mechanism that is used to control gene expression and thus enzyme activity is by Operon Model.
Operon is regulatory gene that is consists of
- Regulator gene: Responsible for repressor protein expression
- Promoter: RNS Polymerase attachment site
- Operator: Repressor binding site
- Structural gene: Enzyme coding sequence of gene
Gene expression and thus enzyme activity is controlled by either Repressor or Activator.
Repressor control the activity by blocking the mRNA transcription. Repressor bind to the portion of DNA that is also known as Operator which is downstream to the promoter. This binding prevents the RNA polymerase binding and thus prevents further activity. For example - TRP operon
Activator control the activity by activating genes which has a promoter which disables the RNA polymerase binding. In this case, promoter is situated close to activator bnding site. In normal condition, this is allosteric protein to which mRNA polymerase cannot bind. Thus preventing gene expression.
Attached is the textbook image of an operon for your reference.
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Operon is regulatory gene that is consists of
- Regulator gene: Responsible for repressor protein expression
- Promoter: RNS Polymerase attachment site
- Operator: Repressor binding site
- Structural gene: Enzyme coding sequence of gene
Gene expression and thus enzyme activity is controlled by either Repressor or Activator.
Repressor control the activity by blocking the mRNA transcription. Repressor bind to the portion of DNA that is also known as Operator which is downstream to the promoter. This binding prevents the RNA polymerase binding and thus prevents further activity. For example - TRP operon
Activator control the activity by activating genes which has a promoter which disables the RNA polymerase binding. In this case, promoter is situated close to activator bnding site. In normal condition, this is allosteric protein to which mRNA polymerase cannot bind. Thus preventing gene expression.
Attached is the textbook image of an operon for your reference.
If this helps, please mark as Brainliest.
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Groups of genes coding for related proteins are arranged in units which are called operon.
An operon consists of these four parts an operator, promoter, regulator and structural genes. The regulator gene codes for a repressor protein that binds to the operator obstructing the promoter of the structural genes. This is how transcription of genes takes place.
Promoter is the part of the DNA to which RNA polymerase binds before opening of the segment of the DNA to be transcribed. The part of the DNA that codes for a special polypeptide is known as structural gene.
An operon consists of these four parts an operator, promoter, regulator and structural genes. The regulator gene codes for a repressor protein that binds to the operator obstructing the promoter of the structural genes. This is how transcription of genes takes place.
Promoter is the part of the DNA to which RNA polymerase binds before opening of the segment of the DNA to be transcribed. The part of the DNA that codes for a special polypeptide is known as structural gene.
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